The presence of protons and neutrons at the centre of the atom was suggested by:

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

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

(iii) Bohr’s atomic model

The presence of electrons outside the nucleus and nucleus at the centre of the atom was suggested by:

The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?