Structure of the Atom

Which of the following is an isotope of hydrogen?

1. Helium
2. Deuterium
3. Oxygen
4. Nitrogen

Isotopes are atoms of the same element having

1. Different atomic numbers but same mass numbers
2. Same atomic number but different mass numbers
3. Different numbers of protons only
4. Different numbers of electrons only

An atom is electrically neutral because

1. It contains only neutrons.
2. It has equal numbers of protons and electrons.
3. It contains no electrons.
4. It contains equal numbers of protons and neutrons.

The maximum number of electrons that can be accommodated in the K-shell is

1. 8
2. 18
3. 2
4. 32

Which shell is filled first according to Bohr's model?

1. L-shell
2. M-shell
3. K-shell
4. N-shell

Who discovered the neutron?

1. J.J. Thomson
2. Ernest Rutherford
3. James Chadwick
4. Niels Bohr

Which atomic model is popularly known as the 'Plum Pudding Model'?

1. Rutherford's Model
2. Bohr's Model
3. Thomson's Model
4. Chadwick's Model

The mass number of an atom is equal to

1. Number of protons only
2. Number of electrons only
3. Number of protons + number of neutrons
4. Number of neutrons only

The atomic number of an element is equal to the number of

1. Neutrons
2. Electrons and neutrons together
3. Protons
4. Nucleons

Who discovered the nucleus of the atom?

1. J.J. Thomson
2. James Chadwick
3. Ernest Rutherford
4. Niels Bohr

Which subatomic particle has no electrical charge?

1. Proton
2. Electron
3. Neutron
4. Positron

Which subatomic particle has a positive charge?

1. Electron
2. Neutron
3. Proton
4. Photon

Which subatomic particle carries a negative charge?

1. Proton
2. Neutron
3. Electron
4. Nucleus

Who discovered the electron?

1. Ernest Rutherford
2. J.J. Thomson
3. James Chadwick
4. Niels Bohr