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An element is isobaric with the inert ga...

An element is isobaric with the inert gas atom `._(18)A^(40)`. The electronic arrangement of the element is `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(2) 4s^(2)`. How many neutrons does each atom of the element carry in its nucleus?

A

22

B

20

C

18

D

16

Text Solution

Verified by Experts

The correct Answer is:
B
Atomic number of inert gas atom = 20
Atomic mass of inert gas atom = 40 (isobaric to `Ar^(40)`)
`:.` Number of neutrons = 40 - 20 = 20
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