[2019]
(a) 2 protons and 2 neutrons only
(b) 2 electrons, 2 protons and 2 neutrons
(c) 2 electrons and 4 protons only
(d) 2 protons only
Correct Answer: 57.(a)
Solution:
α-particle is nucleus of helium He++ which has two protons and two neutrons.
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