(X-Y -----> X ^. + Y ^. )

Values are taken from Blanksby and Ellison, Acc. Chem. Res. 2003, 36, 255. They have been rounded to the nearest whole number. Errors in measurement may make values appear out of order, e.g., C-Br. The Ellison paper is here in pdf format. Older, but acceptable, values in parentheses are summarized in McMillen and Golden, Annu. Rev. Phys. Chem. 1982, 33, 493. Vollhardt and Schore use the Ellison values. For a discussion of BDEs and heats of formation, click here.

C-H Bonds

CH3-H	CH3CH2-H	(CH3)2CH-H	(CH3)3C-H	CH2=CHCH2-H	PhCH2-H	CH2=CH-H	C6H5-H	HCC-H
105	101	99	97	89	90	110	113	133

C-C Bonds

CH3-CH3	CH3CH2-CH3	(CH3)2CH-CH3	CH3CH2-CH2CH3	(CH3)3C-CH3
90	89	89	88	88

C-F Bonds

CH3-F	CH3CH2-F	(CH3)2CH-F	(CH3)3C-F
115	-	111	-

C-Cl Bonds

CH3-Cl	CH3CH2-Cl	(CH3)2CH-Cl	(CH3)3C-Cl
84	85	85	85

C-Br Bonds

CH3-Br	CH3CH2-Br	(CH3)2CH-Br	(CH3)3C-Br
72	72	74	73

C-I Bonds

CH3-I	CH3CH2 -I	(CH3)2CH-I	(CH3)3C-I
58	57	57	56

H-X Bonds

H-F	H-Cl	H-Br	H-I	H-H	HO-H	HOO-H	H2N-H
136	103	88	71	104	119	88	108

X-X Bonds

F-F	Cl-Cl	Br-Br	I-I	HO-OH
(36)	(58)	(46)	(36)	(51)