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An element M has an atomic number 9 and ...

An element M has an atomic number 9 and mass number 19. Its ion will be represented by
(1) M (2) `M^(2+)` (3) `M^(-)` (4) `M^(2-)`

A

`M^(+)`

B

`m^(2+)`

C

`M^(-)`

D

`M^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
C
The element is F. Its ion is `F^(-)` i.e., `M^(-)` (electronic configuration of `M = ns^(2) np^(5)`). It will gain one electron to acquire stable configuration.
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