Structure of the Atom

This is an MCQ based on the Structure of the Atom.

This includes Neutrons, Electrons, Protons, Isotopes, Isobars, and Isotones.

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Which of the following correctly represents the electronic distribution in the Mg atom?

3, 8, 1 2, 8, 2 1, 8, 3 8, 2, 2

Which of the following are true for an element? (i) Atomic number = number of protons + number of electrons (ii) Mass number = number of protons + number of neutrons (iii) Atomic mass = number of protons = number of neutrons (iv) Atomic number = number of protons = number of electrons

(i) and (ii) (i) and (iii) (ii) and (iii) (ii) and (iv)

Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order (i) Rutherford’s atomic model (ii) Thomson’s atomic model (ii) Bohr’s atomic model

(i), (ii) and (iii) (ii), (iii) and (i) (ii), (i) and (iii) (iii), (ii) and (i)

The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

13 10 14 16

Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of

Electron

Proton

Nucleus in the atom

Atomic mass

Who discovered the electron?

Rutherford Chadwick Thomson Goldstein

Which isotope is used in the nuclear power plants to generate electricity?

Uranium 235 Iodine 131 Cobalt 60 Uranium 238

Why was the Thomson’s Model of an atom failed? i. It could not explain the screening of negative charges from that of positive ii. It did not tell about the presence of electrons iii. It did not give an idea about the discrete energy levels iv. It explained the atom as a whole to be electrically neutral Choose the correct option from the following:

Only (iii) Both (i) & (iii) Only (i) Both (ii) & (iv)

What was the source of alpha particles in Rutherford scattering experiment?

Hydrogen nucleus Argon nucleus Helium nucleus None of these

What property of an element determines its chemical behaviour?

Size of an element Valency of an element Molar mass of the element None of these

Who discovered the nucleus of an atom?

J.J. Thomson Neils Bohr Rutherford J. Chadwick

Who is known as the ‘Father of nuclear Physics’?

J. J. Thomson E. Rutherford Neils Bohr J. Chadwick

An atomic number of an element equals to what present in the nucleus of its atom?

Protons Electrons Both of them None of them

Rutherford’s alpha-particle scattering experiment was responsible for the discovery of:

Atomic nucleus Electron Proton Neutron

Isotopes of an element have:

The same physical properties

Different chemical properties

Different number of neutrons

Different atomic numbers

The charge on an electron is equal to:

1.6 × 10^-19 C of -ve charge 2.6 × 10^-19 C of -ve charge 1.6 × 10^-22 C of -ve charge 1.6 × 10^-23 C of -ve charge

There are three isotopes of carbon which are named as C-12, C-13 and C-14 out of which C-12 is the most abundant isotope. In the given structures of 3 isotopes, what will be the composition of the nucleus?

C-12 : 6p + 6n, C-13 : 7p + 6n, C-14 : 8p + 6n C-12 : 6p + 6n, C-13 : 6p + 7n, C-14 : 6p + 8n C-12 : 6p + 6n, C-13 : 5p + 8n, C-14 : 7p + 7n C-12 : 6p + 6n, C-13 : 12p + 1n, C-14 : 5p + 9n

An alpha particle is also known as:

Subatomic particle An unionised helium atom A neutral particle A doubly-charged helium ion

Quiz/Test Summary

Title: Structure of the Atom

Questions: 18

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