can you explain these?

the heat of atomiza5ion is the change in enthalpy accompanying the conversion of 1 mole of an element or a compound in its most stable state at 298 K and 1 atmosphere into free atoms. Use Slater's rule to rationalize the following two observations.

a) ΔH (C) = 171 kcal/mol > ΔH (Si) = 108 kcal/mol

b) ΔH (Cr) = 95 kcal/mol < ΔH (Mo) = 157 kcal/mol

can you explain a and b?

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