A) 2 protons and 2 electrons
B) 2 neutrons, 2 protons and 2 electrons
C) 2 protons and 2 neutrons
D) 2 positrons and 2 protons
Correct Answer: C
Helium nucleus R $ _{2}He^{4} $ . Number of protons = Z = 2 Number of Neutrons = A - Z = 2.
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