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An ion has a charge of -1 . It has eight...

An ion has a charge of -1 . It has eighteen electrons and twenty neutrons. Its mass number is

A

17

B

37

C

18

D

38

Text Solution

Verified by Experts

The correct Answer is:
B
No. of electrons e = 18
No. of protons p = 18 - 1 = 17
No. of neutrons n = 20
Mass number A = 17 + 20 = 37.
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