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Identify the number of neutrons present ...

Identify the number of neutrons present in a pair of elements with atomic numbers 20 and 13, if their mass numbers are 40 and 27, respectively.

A

20 and 13

B

20 and 13

C

17 and 20

D

20 and 14

Text Solution

Verified by Experts

The correct Answer is:
4
`A-Z=n`
(1) 40 - 20 =20
(2) 27 - 13 =14
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