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

Atomic number is ______________.
  • the total number of protons present in the nucleus of an atom.
  • an atom of each element having a definite combining capacity.
  • the electrons present in the outermost shell of an atom.
  • an outermost-shell, which had eight electrons.
While revolving in discrete orbits, the electrons do not radiate energy. These orbits or shells are called ________.
  • isotope
  • isobars
  • nucleus
  • energy levels
Atomic number is denoted by ________.
  • A
  • X
  • Z
  • M
Absolute mass of a proton is equal to __________.
  • $$9.109\times10^{-31}$$ kg
  • $$-1.602\times10^{-31}$$ kg
  • $$1.672\times10^{-27}$$ kg
  • $$1.674\times10^{-27}$$ kg
Which of these have the same chemical properties, but their physical properties may be different?
  • Atomic number
  • Mass number
  • Isotopes
  • Isobars
Elements which have fully filled valence shell electrons belong to :
  • halogens
  • noble gases
  • chalcogens
  • alkali metals
Mass number is ___________.
  • the sum of the total number of protons and neutrons present in the nucleus of an atom.
  • the electrons present in the outermost shell of an atom.
  • an atom of each element having a definite combining capacity.
  • the total number of protons present in the nucleus of an atom.
Which of the following is not true for $$\displaystyle _7N ^{ 14 }$$ ?
  • 14 is the mass number
  • 7 is the atomic number
  • N is the symbol for nitrogen
  • 14 is the atomic number
Absolute mass of neutrons is ____ .
  • $$9.109\times10^{-31}$$ kg
  • $$-1.602\times10^{-31}$$ kg
  • $$1.672\times10^{-27}$$ kg
  • $$1.674\times10^{-27}$$ kg
Elements are defined by the number of _______ they possess.
  • electrons
  • protons
  • neutrons
  • atoms
The charge on a proton is ___________.
  • $$-1602\times10^{-19}C$$
  • $$1.602\times10^{-19}C$$
  • $$0$$
  • None of the above
Protons and neutrons are also called __________.
  • nucleons
  • isotope
  • isobars
  • elements
Absolute mass of electron is equal to __________.
  • $$9.109\times10^{-31}$$ kg
  • $$-1.602\times10^{-31}$$ kg
  • $$1.672\times10^{-27}$$ kg
  • $$1.647\times10^{-27}$$ kg
Which of the following is the correct properties of matter?
  • have no mass but occupies space
  • have mass but occupies no space
  • have no mass and occupies no space
  • it have mass and occupies space
Everything in the universe is made up of material called as _______.
  • life
  • water
  • matter
  • None of the above
Which of the following cannot be considered as matter?
  • Love
  • Nitrogen
  • Mixture
  • Water
Thomson's model of atom is also known as:
  • water-melon model
  • raisin pudding model
  • plum pudding model
  • Rutherford's model
Which of the following are states of matter?
  • solid
  • liquid
  • gases
  • all of the above
According to modern atomic theory atoms of argon and calcium have same atomic weight, these are known as :
  • Isobars
  • Isotopes
  • None of these
  • Both a and b
 What tool was Thomson using when he discovered the electron?
  • Magnifying Glass
  • Hammer
  • Cathode Ray
  • Microscope
Bohr modified the ___________ by adding that the electrons move in orbits of fixed size and energy.
  • Rutherford's model
  • Dalton's model
  • Thomson's model
  • Goldstein's model
Thomson's atomic model concluded that _____ is the constituent particle of all kinds of atoms.
  • electron
  • protron
  • neutron
  • none of these
An atom does not carry any electric charge because it _____________.
  • has an equal number of charged and non charged particles
  • has neutrons in their nuclei
  • has an equal number of electrons and protons, hence positive and negative charge gets neutralized.
  • 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:
  • neutral
  • negatively charged
  • positively charged
  • both A and B
The atomic number is identical to the amount of ______ in the atom nucleus. 
  • Protons
  • Neutrons
  • Both a and b
  • None of above
Atomic number of an atom is equal to the __________.
  • number of protons
  • number of electrons
  • both a and b
  • sum of proton and electron
Which one among the following principal energy level has exactly four subshells?
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
  • $$5$$
Atomic number of nitrogen is 7 . The number of protons in Nitrogen atom is equal to ________.
  • 14
  • 7
  • 21
  • 15
Which of the following is NOT a postulate of Bohr's model of the hydrogen atom? 
  • Gases excited by a voltage emits a bright-light emission spectrum.
  • The position of an electron in the hydrogen atom is not defined.
  • Electron absorbs energy to make transition to a higher energy level.
  • Electron emits energy when it makes transition to a lower energy level.
  • The energy levels of the electron are quantized.
What is the atomic number of Krypton?
  • 36
  • 35
  • 38
  • 34
Identify which of the following has mass and takes up space is :
  • energy
  • work
  • matter
  • acceleration
  • force
For an element, $$A= 34$$ and $$N= 19$$, What is the atomic number of the element?
  • $$34$$
  • $$19$$
  • $$53$$
  • $$15$$
Which of the following is a matter?
  • Chair
  • Smell
  • Love
  • Cold
What is the name for the number of protons in an atom?
  • Atomic identity
  • Atomic mass
  • Atomic weight
  • Atomic number
Which of the following is neutral and weighs 1 amu?
  • Proton
  • Neutron
  • Electron
  • Isotope
  • Ion
Which of the following has negligible weight as compared to others?
  • Proton
  • Neutron
  • Electron
  • Isotope
  • Hydrogen ion
Which of the following has a negative charge and is present in atoms as pairs with opposite spin?
  • Proton
  • Neutron
  • Electron
  • Isotope
  • Ion
If two atoms are isotopes, in what characteristic do they differ? 
  • Number of protons
  • Number of neutrons
  • Number of electrons
  • Atomic number
  • Electronic charge
What is the correct order in which the listed atomic models were advanced and accepted, earliest first?
  • Bohr, planetary, plum pudding
  • Planetary, Bohr, plum pudding
  • Plum pudding, Bohr, planetary
  • Plum pudding, planetary, Bohr
  • Planetary, plum pudding, Bohr
By knowing the number of protons in a neutral atom, one can determine :
  • the identity of the element.
  • the number of neutrons in the atom.
  • the number of common isotopes of the element.
  • the atomic radius size.
Who proposed the planetary model of the atom?
  • Earnest Rutherford
  • Max Planck
  • Neils Bohr
  • James Chadwick
  • J.J. Thompson
Atomic number of element ___________ is $$19$$.
  • $$Mg$$
  • $$K$$
  • $$Ar$$
  • $$Ca$$
Which of the following is the standard for atomic mass?
  • $$^1_1H$$
  • $$^{12}_6C$$
  • $$^{14}_6C$$
  • $$^{16}_8C$$
Plum Pudding Model of the Atom was given by:
  • Thomson
  • Rutherford
  • Bohr
  • Chadwick
How much energy would be required by an electron while moving from ground state to 3rd excited state in $$H{e^ + }$$  ion 
  • 40.8 ev
  • 10.2 ev
  • 51 ev
  • 35 ev
According to Bohr's model of hydrogen atom, relation between principal quantum number n and radius of stable orbit is 
  • $$r \propto \frac{1}{n}$$
  • $$r \propto n$$
  • $$r\propto\frac{1}{n^2}$$
  • $$r\propto n^2$$
Number of electrons surroundings Kr in $$Kr{F_2}$$ is: 
  • $$10$$
  • $$6$$
  • $$4$$
  • $$8$$
Atomic number of elements represent
  • Number of protons in the nucleus
  • Number of neutrons in the nucleus
  • Number of protons an neutrons in the nucleus
  • The valency of an element
The atomic number of an element is derived from
  • Number of electrons
  • Number of protons
  • Number of neutrons
  • Number of isotopes
  • Number of nucleons
Mosley's name is most closely associated with the discovery of 
  • Positron
  • Deutrons
  • Atomic number
  • Atomic weight
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