MCQ Questions for 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.

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

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

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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

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

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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$Ca$

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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$^{16}_8C$

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

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

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

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

CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 2 - MCQExams.com

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Practice Class 11 Medical Chemistry Quiz Questions and Answers

CBSE Questions for Class 11 Medical Chemistry Structure Of Atom Quiz 2 - MCQExams.com

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Practice Class 11 Medical Chemistry Quiz Questions and Answers

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