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CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 2 - MCQExams.com
CBSE
Class 11 Medical Chemistry
Structure Of Atom
Quiz 2
Atomic number is ______________.
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the total number of protons present in the nucleus of an atom.
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an atom of each element having a definite combining capacity.
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the electrons present in the outermost shell of an atom.
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an outermost-shell, which had eight electrons.
Explanation
The atomic number is defined as the total number of protons present in the nucleus of an atom.
While revolving in discrete orbits, the electrons do not radiate energy. These orbits or shells are called ________.
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isotope
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isobars
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nucleus
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energy levels
Explanation
While revolving in discrete orbits, the electrons do not radiate energy. These orbits or shells are called energy levels.
Atomic number is denoted by ________.
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A
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X
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Z
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M
Explanation
Atomic number is denoted by Z.
Absolute mass of a proton is equal to __________.
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$$9.109\times10^{-31}$$ kg
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$$-1.602\times10^{-31}$$ kg
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$$1.672\times10^{-27}$$ kg
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$$1.674\times10^{-27}$$ kg
Explanation
The mass of proton is equal to
$$1.672\times10^{-27}$$ kg.
Hence the correct option is C.
Which of these have the same chemical properties, but their physical properties may be different?
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Atomic number
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Mass number
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Isotopes
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Isobars
Explanation
Isotopes have same chemical properties, but their physical properties might be different.
Chemical properties of an element depend on its atomic number or number of protons. Isotopes of an element have the same atomic number, hence their chemical properties are the same. But their physical properties may vary.
Elements which have fully filled valence shell electrons belong to :
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halogens
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noble gases
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chalcogens
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alkali metals
Explanation
Noble gas has fully filled valence shell electrons as these belongs to stable configurations
Mass number is ___________.
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the sum of the total number of protons and neutrons present in the nucleus of an atom.
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the electrons present in the outermost shell of an atom.
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an atom of each element having a definite combining capacity.
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the total number of protons present in the nucleus of an atom.
Explanation
The mass number is defined as the sum of the total number of protons and neutrons present in the nucleus of an atom.
Which of the following is not true for $$\displaystyle _7N ^{ 14 }$$ ?
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14 is the mass number
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7 is the atomic number
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N is the symbol for nitrogen
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14 is the atomic number
Explanation
The general notation of an element is: $$_Z X^A$$, where X is the symbol of the element, Z its atomic number and A is the mass number.
So, in
$$_7 X^14$$,
14 is the mass number of nitrogen while 7 is the atomic number.
Absolute mass of neutrons is ____ .
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$$9.109\times10^{-31}$$ kg
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$$-1.602\times10^{-31}$$ kg
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$$1.672\times10^{-27}$$ kg
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$$1.674\times10^{-27}$$ kg
Explanation
The mass of neutrons is
$$1.674\times10^{-27}$$ kg
Elements are defined by the number of _______ they possess.
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electrons
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protons
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neutrons
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atoms
Explanation
Elements are defined by the number of protons they possess.
The charge on a proton is ___________.
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$$-1602\times10^{-19}C$$
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$$1.602\times10^{-19}C$$
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$$0$$
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None of the above
Explanation
The charge on protons is equal to $$1.602\times10^{-19}C$$
Protons and neutrons are also called __________.
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nucleons
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isotope
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isobars
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elements
Explanation
Protons and neutrons are also called nucleons.
Absolute mass of electron is equal to __________.
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$$9.109\times10^{-31}$$ kg
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$$-1.602\times10^{-31}$$ kg
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$$1.672\times10^{-27}$$ kg
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$$1.647\times10^{-27}$$ kg
Explanation
The mass of an electrons is $$9.109\times10^{-31}$$ kg.
Hence the correct option is A.
Which of the following is the correct properties of matter?
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have no mass but occupies space
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have mass but occupies no space
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have no mass and occupies no space
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it have mass and occupies space
Explanation
Matter is something that has mass and occupies space.
It can be living or non-living.
Hence the correct option is D.
Everything in the universe is made up of material called as _______.
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life
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water
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matter
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None of the above
Explanation
Everything in this universe is made up of material which scientists have named "matter".
It can be living or non-living.
For example, human beings are matter as well as a duster is also a matter.
Hence the correct option is C.
Which of the following cannot be considered as matter?
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Love
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Nitrogen
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Mixture
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Water
Explanation
Love cannot be considered as matter as it does not have mass and volume.
Thomson's model of atom is also known as:
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water-melon model
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raisin pudding model
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plum pudding model
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Rutherford's model
Explanation
Thomson's model of atom is also known as
water-melon model,
raisin pudding model and
plum pudding model. The representation of the atom in Thomson's model represents a pudding and a watermelon.
Which of the following are states of matter?
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solid
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liquid
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gases
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all of the above
Explanation
There are three states of matter: Solid, liquid, gases.
According to modern atomic theory atoms of argon and calcium have same atomic weight, these are known as :
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Isobars
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Isotopes
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None of these
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Both a and b
Explanation
Atoms having same atomic weights are known as isobars.
What tool was Thomson using when he discovered the electron?
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Magnifying Glass
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Hammer
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Cathode Ray
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Microscope
Bohr modified the ___________ by adding that the electrons move in orbits of fixed size and energy.
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Rutherford's model
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Dalton's model
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Thomson's model
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Goldstein's model
Explanation
Bohr modified the Rutherford model by adding that the electrons move in orbits of fixed size and energy. Electrons revolve around the nucleus in concentric circular orbits at fixed distance from the nucleus.
These are stationary orbits and the energy of electrons in these orbits is constant.
Thomson's atomic model concluded that _____ is the constituent particle of all kinds of atoms.
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electron
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protron
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neutron
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none of these
Explanation
Thomson experiments with cathode-ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons.
So, option A is correct.
An atom does not carry any electric charge because it _____________.
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has an equal number of charged and non charged particles
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has neutrons in their nuclei
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has an equal number of electrons and protons, hence positive and negative charge gets neutralized.
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has an equal number of neutrons and protons
Explanation
Equal number of negatively charged electrons and positively charged protons would give a neutral atom which would thus not have any electric charge.
Thomson showed that the stream of particles in cathode ray tube is made up of small particles which are a component of the atom and is:
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neutral
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negatively charged
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positively charged
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both A and B
Explanation
Thomson discovered electrons using the cathode ray tube. It has been previously seen that if a electric current is passed through a vacuum tube, a glowing stream is formed. Thomson found that the mysterious glowing stream would bend toward a positively charged electric plate. He concluded that the stream is negatively charged. He also concluded based on his experiments that the negative stream has negatively charged particles that he called corpuscles (later renamed electrons).
The atomic number is identical to the amount of ______ in the atom nucleus.
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Protons
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Neutrons
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Both a and b
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None of above
Explanation
The element number is identical to the amount of protons in the atom nucleus. The amount of neutrons of an element varies, two atoms with the same amount of protons and neutrons are of the same isotope.
Atomic number of an atom is equal to the __________.
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number of protons
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number of electrons
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both a and b
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sum of proton and electron
Explanation
Atomic number (Z) is the number of protons in an atom. It is also equal to the number of electrons in the atom.
Atomic number $$=$$ number of protons
Example: the atomic number of an element is 12, then, its atom contains 12 protons and 12 electrons.
Which one among the following principal energy level has exactly four subshells?
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$$1$$
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$$2$$
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$$3$$
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$$4$$
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$$5$$
Explanation
The fourth principal energy level $$(n=4)$$ has exactly four subshells $$ 4s, 4p, 4d$$ and $$4f$$.
Atomic number of nitrogen is 7 . The number of protons in Nitrogen atom is equal to ________.
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14
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7
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21
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15
Explanation
Since, atomic number $$ =$$ Number of protons$$ = $$Number of electrons
Therefore, number of electrons in nitrogen $$= 7$$
Number of protons in nitrogen$$ = 7$$
Which of the following is NOT a postulate of Bohr's model of the hydrogen atom?
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Gases excited by a voltage emits a bright-light emission spectrum.
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The position of an electron in the hydrogen atom is not defined.
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Electron absorbs energy to make transition to a higher energy level.
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Electron emits energy when it makes transition to a lower energy level.
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The energy levels of the electron are quantized.
Explanation
Bohr showed that the electron in the hydrogen atom could only be found in certain selected (quantized) orbits, and no others.
What is the atomic number of Krypton?
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36
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35
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38
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34
Explanation
The atomic number is the number of protons in an atom of an element.
An atom of Krypton has 36 protons in its nucleus.
Hence, Krypton's atomic number is 36.
Hence, the correct option is $$\text{A}$$
Identify which of the following has mass and takes up space is :
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energy
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work
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matter
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acceleration
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force
Explanation
Anything that has mass and posses space is known as matter.
Hence the correct option is C.
For an element, $$A= 34$$ and $$N= 19$$, What is the atomic number of the element?
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$$34$$
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$$19$$
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$$53$$
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$$15$$
Explanation
A is the mass number and N is the number of neutrons.
$$A = Z + N$$
$$Z = A - N$$
$$Z = 34 - 19$$
$$Z = 15$$
Hence, the atomic number is $$15$$.
Which of the following is a matter?
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Chair
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Smell
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Love
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Cold
What is the name for the number of protons in an atom?
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Atomic identity
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Atomic mass
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Atomic weight
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Atomic number
Explanation
Atomic number is
the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
Which of the following is neutral and weighs 1 amu?
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Proton
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Neutron
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Electron
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Isotope
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Ion
Explanation
A neutron is electrically neutral particle. And its mass is 1 amu or $$ {1.67} $$ $$ {\times} $$ $$ {10}^{-27} $$ Kg
Thus, option $$B$$ is the correct answer.
Which of the following has negligible weight as compared to others?
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Proton
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Neutron
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Electron
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Isotope
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Hydrogen ion
Explanation
Option $$C$$ is the correct answer.
Mass of an electron is very negligible. It is $$ {9.1}{\times}{10}^{-31} $$ Kg.
Which of the following has a negative charge and is present in atoms as pairs with opposite spin?
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Proton
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Neutron
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Electron
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Isotope
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Ion
Explanation
An electron is a negatively charged particle. In an orbital, if two electrons are present together, they should and must have opposite spins. Because no two electrons can be identically the same.
Option C is the correct answer.
If two atoms are isotopes, in what characteristic do they differ?
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Number of protons
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Number of neutrons
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Number of electrons
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Atomic number
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Electronic charge
Explanation
Isotopes are atoms with the same number of protons but that have a different number of neutrons.
What is the correct order in which the listed atomic models were advanced and accepted, earliest first?
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Bohr, planetary, plum pudding
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Planetary, Bohr, plum pudding
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Plum pudding, Bohr, planetary
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Plum pudding, planetary, Bohr
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Planetary, plum pudding, Bohr
Explanation
J.J. Thomson proposed plum pudding model in 1904. Ernest Rutherford introduced the planetary model of an atom in 1911 which was modified by Neils Bohr in 1913 as Bohr model of an atom.
Order in which the atomic models were advanced : Plum pudding, planetary, Bohr
By knowing the number of protons in a neutral atom, one can determine :
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the identity of the element.
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the number of neutrons in the atom.
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the number of common isotopes of the element.
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the atomic radius size.
Explanation
$$(A)$$ the identity of the element.
In a neutral atom, the number of protons is always the atomic number of the element and uniquely identifies the element. and in this, the number of positive protons and negative electrons is always equal.
Who proposed the planetary model of the atom?
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Earnest Rutherford
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Max Planck
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Neils Bohr
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James Chadwick
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J.J. Thompson
Explanation
Neils Bohr proposed the planetary model of the atom in 1913 that the electrons revolve in a fixed orbit around the nucleus just as all the planets revolve around the sun in solar system.
Atomic number of element ___________ is $$19$$.
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$$Mg$$
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$$K$$
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$$Ar$$
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$$Ca$$
Explanation
Atomic number of potassium (K) is 19.
Atomic numbers of Mg, Ar and Ca are 12, 18 and 20 respectively.
Which of the following is the standard for atomic mass?
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$$^1_1H$$
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$$^{12}_6C$$
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$$^{14}_6C$$
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$$^{16}_8C$$
Explanation
An atomic mass unit (symbolized amu) is defined as precisely 1/12 the mass of an atom of carbon-12. The carbon-12 (C-12) atom has six protons
and six neutrons in its nucleus.
Plum Pudding Model of the Atom was given by:
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Thomson
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Rutherford
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Bohr
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Chadwick
Explanation
J. J. Thomson's model was also known as the plum pudding model according to which positive charge is distributed uniformly throughout the atom and negative charge is dispersed in it.
Hence, the correct option is $$A$$
How much energy would be required by an electron while moving from ground state to 3rd excited state in $$H{e^ + }$$
ion
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40.8 ev
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10.2 ev
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51 ev
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35 ev
Explanation
3rd excited state means 4th orbit
According to Bohr's model of hydrogen atom, relation between principal quantum number n and radius of stable orbit is
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$$r \propto \frac{1}{n}$$
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$$r \propto n$$
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$$r\propto\frac{1}{n^2}$$
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$$r\propto n^2$$
Explanation
Let an electron (mass m), is revolving around nucleus of a hydrogen atom in an orbit of radius $$r$$ with velocity $$v$$. Electron gets centripetal force to revolve, from the electrostatic attraction force between electron and nucleus,
$$\dfrac{mv^{2}}{r}=\dfrac{e\times e}{4\pi\varepsilon_{0}r^{2}}$$ (for H- atom, $$Z=1$$ hence charge on nucleus is $$=e$$)
$$mv^{2}=\dfrac{e^{2}}{4\pi\varepsilon_{0}r}$$ ...................eq1
According to Bohr's model, angular momentum of electron :
$$mvr=\dfrac{nh}{2\pi}$$ ..................eq2
Now, squaring eq2 and dividing by eq1, we get
$$\dfrac{mv^{2}r^{2}}{mv^{2}}=\dfrac{n^{2}h^{2}4\pi\varepsilon_{0}r}{4\pi^{2}e^{2}}$$
$$r=\dfrac{n^{2}h^{2}\varepsilon_{0}}{\pi me^{2}}$$
which gives $$r\propto n^{2}$$
Number of electrons surroundings Kr in $$Kr{F_2}$$ is:
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$$10$$
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$$6$$
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$$4$$
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$$8$$
Atomic number of elements represent
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Number of protons in the nucleus
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Number of neutrons in the nucleus
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Number of protons an neutrons in the nucleus
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The valency of an element
Explanation
Atomic number is the number of protons in nucleus of an atom.
The atomic number of an element is derived from
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Number of electrons
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Number of protons
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Number of neutrons
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Number of isotopes
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Number of nucleons
Explanation
The atomic number is number of protons in the nucleus of an atom.
Mosley's name is most closely associated with the discovery of
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Positron
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Deutrons
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Atomic number
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Atomic weight
Explanation
Correct option is C.
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