Why is the chloride ion shown as containing only 3 lone pairs?

1 Answer
Apr 29, 2017

Answer:

It does have the four lone pairs, does it not?

Explanation:

An isolated chlorine ATOM has 7 valence electrons. And thus the parent dichlorine molecule tends to be an OXIDANT, viz......

#1/2Cl_2 + e^(-) rarr Cl^(-)#

And because the resultant chloride anion has FOUR SUCH LONE PAIRS, instead of the SEVEN electrons associated with the NEUTRAL atom, chloride has a FORMAL NEGATIVE CHARGE.

Sorry for all the SHOUTING; there are a few points worth EMPHASIZING.

How are these four lone pairs distributed? That is, how would you predict electronic geometry?