Question

What is an `"anion"`?

Answer 1

`"An ion with a single negative charge..........."`

Explanation:

And we can represent such ion formation by the reaction:

`1/2X_2 + e^(-) rarr X^(-)`

Such reduction fills the valence shell of the halide to give an electronic count of `8`; the halide ion, `X^-`, is reasonably stable.