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

Options

A. `M^(+)`
B. `m^(2+)`
C. `M^(-)`
D. `M^(2-)`

Answer

C

Explanation

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.