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What happens when alpha-particle is emit...

What happens when `alpha-`particle is emitted

A

Mass number decreases by 12 unit, atomic number decreases by 4 unit

B

Mass number decreases by 4 unit, atomic number decreases by 2 unit

C

Only mass number decreases

D

Only atomic number decreases

Text Solution

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The correct Answer is:
B
`alpha `- particle is `""_(2)He^4`
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