What is an $"anion"$ ?

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Answer 1 · 2017-04-12T03:56:41

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

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.

What is an "anion""anion"?