For s- and p-block elements, the configuration energy (CE) is defined as :

Correct Answer: (A) CE = (n e_g + m e_g) / (n + m)

For s- and p-block elements in quantum chemical atomic calculations, configuration energy (CE) is fundamentally defined as the weighted average energy expression given by CE = (n e_g + m e_g) / (n + m). This formulation accounts for valence shell configurations across periods.