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An element M has an atomic mass 19 and a...

An element `M` has an atomic mass `19` and atomic number `9`. Its ion is represented by

A

`M^+`

B

`M^(2+)`

C

`M^-`

D

`M^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
C
`M(Z=9) : 1s^2 2s^2 2p^5`
This is fluorine, its ion is `F^-` (formed by accepting an electron to complete its octet) or `M^-`.
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