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b) NOTE THIS STEP : Write configuration of all species. Half filled and full filled orbitals are more stable as compared to nearly half filled and nearly full filled orbitals.
Li = 1s2, 2s2; Be- = 1s2, 2s2, 2p1
B- = 1s2, 2s2, 2p2 ; C- = 1s2, 2s2, 2p3
? Be– will be least stable. It has lowest I.E.
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