Electronegativity and Bonding Type

period

2

3

4

	EN	Σ EN	Δ EN
Li	0.98	2.0	0.
LiBe	--	2.6	0.6
LiB	--	3.0	1.1
LiC	--	3.5	1.6
LiN	--	4.0	2.1
LiO	--	4.4	2.5
LiF	--	5.0	3.0
Be	1.57	3.14	0.
BeB	--	3.61	0.47
BeC	--	4.12	0.98
BeN	--	4.61	1.47
BeO	--	5.01	1.87
BeF	--	5.55	2.41
B	2.04	4.08	0.
BC	--	4.59	0.51
BN	--	5.08	1.00
BO	--	5.48	1.40
BF	--	6.02	1.94
C	2.55	5.10	0.
CN	--	5.59	0.49
CO	--	5.99	0.89
CF	--	6.53	1.43
N	3.04	6.08	0.
NO	--	6.48	0.40
NF	--	7.02	0.94
O	3.44	6.88	0.
OF	--	7.42	0.54
F	3.98	7.96	0.

The first column of the table contains symbols for compounds of elements within a chosen period (whether or not they exist or what formulas they have). The third and fourth columns of the table give the sum and difference of the electronegativity for the elements in the compounds. The plotted pairs

(ΣEN,ΔEN)

of the compounds form a triangle. The types of bonding (metallic bond/covalent bond/ionic bond) are localized around the three corners of the triangle, with the transitional types between them.