The size of the H-N-H bond angles of the following species increases in which order...?

S

softballkat7

New member
a) NH3 < NH4+ < NH2-
b) NH3 < NH2- < NH4+
c) NH2- < NH3 < NH4+
d) NH2- < NH4+ < NH3
e) NH4+ < NH3 < NH2-

All numbers are subscripts. Also, I would like a bit of explanation, if you could.
 
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