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An atom of mass number 15 and atomic num...

An atom of mass number `15` and atomic number `7` captures an `alpha-`particle and then emits a proton. The mass number and atomic number of the resulting product will respectively be.

A

14 and 2

B

15 and 3

C

16 and 4

D

18 and 8

Text Solution

Verified by Experts

The correct Answer is:
D
`""_(7)X^(15)+underset("particle")underset("Alpha")(""_(2)He^(4))rarr underset("Proton")(""_(1)H^(1))+""_(Z)Y^(A)`
According to the law of conservation of charge number, we get
`7+2=1+Z rArr Z=8`
According to the law of conservation of mass number, we get
`15+4=1+A rArr A=18`
Hence, the resulting atom has mass number 18 and atomic number 8.
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