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Question:

α-particle consists of:

2 protons and 2 neutrons only

2 electrons and 4 protons only

2 electrons, 2 protons and 2 neutrons

2 protons only

Solution:

Correct option is A. 2 protons and 2 neutrons only. α- particle is nucleus of Helium which has two protons and two neutrons. Hence option A is correct answer.