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A radioactiv element has atomic number A...

A radioactiv element has atomic number A and mass number M. It emits one `alpha` - particle .The atomic number and mass number of new element will be

A

A – 2, M – 4

B

A – 2, M

C

A, M – 2

D

A – 4, M – 2

Text Solution

Verified by Experts

The correct Answer is:
A
`""_(A)X^M overset(-alpha)to ""_(A-2)Y^(M-4)`
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