(a) Ernest Rutherford - (iii) Concept of nucleus

Rutherford’s alpha scattering experiment gave the model of the atom with a positively charged nucleus in the center.

(b) J.J.Thomson - (iv) Discovery of electrons

J.J. Thomson identified in his experiment that the atom was not a simple, indivisible particle but contained at least one subatomic particle called electron.

(c) Dalton - (i) Indivisibility of atoms

Dalton’s atomic theory suggested that atoms were indestructible and indivisible. But the discovery of two fundamental particles- protons and electrons inside the atom, led to the failure of this aspect of Dalton’s atomic theory.

(d) Neils Bohr - (ii) Stationary orbits

According to Bohr’s model of an atom, only certain or special orbits of electrons were allowed in an atom. During revolving around these orbits, the electrons do not radiate energy.

(e) James Chadwick - (vi) Neutron

James Chadwick discovered another subatomic particle known as Neutron which had no charge. It has a mass nearly equal to that of a proton. Neutrons are present in the nucleus of all atoms, except hydrogen.

(f) E. Goldstein - (vii) Canal rays

E. Goldstein discovered the presence of new radiations in a gas discharge and called them canal rays. These rays were positively charged radiations and led to the discovery of proton.

(g) Mosley - (v)Atomic number

Mosley developed the concept of Atomic number. Atomic number of is the number of protons in an atom.