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
digAnsr: 1
Ans : ( 1 ) Sol. α-particle is nucleus of Helium which has two protons and two neutrons.