Krishna
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Bond enthalpy:

Bond enthalpy, also known as bond dissociation energy, is defined as energy the energy that is required to break a particular bond in a gaseous compound.

kilojoules per mole, or kJ/mol is the units of the enthalphy.

EXAMPLE:

1) For one of the C-H bonds in ethane ( C_2H_6) is defined by the process

CH_3CH_2-H \rightarrow CH_3CH_2 \cdot + H \cdot

\Delta H = 101.1 \frac{kcal}{mol} (423.0 \frac{kJ}{mol})

The strength of bonds between different atoms varies across the periodic table and is well documented.