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Question

All alpha particles have a charge of

A
0.0
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B
- 2
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C
1
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D
2
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Solution

The correct option is D 2
An alpha (α) particle is a doubly ionised helium nucleus, i.e. a helium atom whose two electrons have been removed. During the process of α-emission, an α-particle is emitted thereby decreasing the mass number of the parent nucleus by 4 and the atomic number by 2.
AZXA4Z2Y + 42He
So, an alpha particle (He2+) has a positive electric charge of two.

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