Question

α-particle consists of :

(1) 2 protons and 2 neutrons only

(2) 2 electrons, 2 protons and 2 neutrons

(3) 2 electrons and 4 protons only

(4) 2 protons only

Comments

Atoms, alpha particle and Rutherford model

Answer 1

Ans: (1) 2 protons and 2 neutrons only

Sol: Alpha particle is nucleus of He which contains 2 protons and 2 neutrons.