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Sub-Atomic Particles

An emission o...

Question

An emission of $α$ -particle decreases the atomic number of parent element by :

A

4

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B

2

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C

3

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D

1

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Solution

The correct option is C 2
$α$ -particle is $H e^{2 +}$ .
Hence, the emission of $α - p a r t i c l e$ decreases the atomic number by 2.

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