the electronegativity difference (AEN):
<0.5: covalent (non polar)
0.5- 1.7: covalent (polar)
> 1.7 : ionic
CF₄
C = 2.5
F = 4
F - C = 4 - 2.5 = 1.5 (covalent polar)
NH₃
N = 3
H = 2.1
N - H = 3 - 2.1 = 0.9 (covalent polar)
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