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NEET 2019

Exam: NEET
Year: 2019
Subject: Physics
Chapter: Nuclear Physics

NEET 2019 · Physics · Nuclear Physics

α -particle consists of&

\text{\alpha}

-particle consists of&

Options

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

A. $2$ protons and $2$ neutrons only

Step-by-step solution

Alpha particles are composite particles consisting of two protons and two neutrons tightly bound together. They are emitted from the nucleus of some radionuclides during radioactive decay, called alpha-decay.

$\alpha$ particle ${\to}_{2}{He}^{4}$

No. of protons $\to 2$

No. of neutrons $\to 4 - 2 = 2$

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