A radioactive nucleus with Z protons and N neutrons emits an -particle, 2-particles and 2 gamma rays. The number of protons and neutrons in the nucleus left after the decay respectively, are
(a) Z – 3, N – 1 (b) Z – 2, N – 2
(c) Z – 1, N – 3 (d) Z, N – 4
(d) With emission of an particle mass number decreases by 4 unit and atomic number decrease by 2 units and with emission of particle atomic number increases by 2 units. So Z will remain same and N will become N-4.