Molecular formula
Atom placement
Sum of valence e-
Remaining valence e-
Lewis structure
For NF3
N
F
F
F
N 5 valence e-
F 7 e-
X 3 = 21 valence e-
Total of 26 valence e-
:
:
:
:
:
:
:
:
:
:
N is less electronegative than F; N is the central atom
Three single bonds = 6 e-
20 remaining valence e-; 6 e-
on each F, 2 e- on N (10 lone-
pairs of electrons)
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