B.Approximation of the atomic orbital energy Example:Mg,1s22s22p63s2 Z-012 E=-R( E=-R2-=-13689R=-R02-03y-13689R 13 Ep=-R2-0.85x2-035×7Y-R78 =-15.40R 22 E.=-R2-100x2-,085x8-035-09025R 32 2.4.2 The ionization energy and the affinity energyB. Approximation of the atomic orbital energy 2 * ( ) n Z E R i n −σ Example: Mg, 1s = − ⋅ 22s22p63s2 E s R R R 136.89R 1 (12 0.3) 136.89 1 (12 ) 2 2 2 2 1 = − − = − = − − = − σ E s p R R 15.40R 4 7.85 2 (12 0.85 2 0.35 7) 2 2 2 2 ,2 = − = − − × − × = − E s R 0.9025R 3 (12 1.00 2 0.85 8 0.35) 2 2 3 = − − × − × − = − 2.4.2 The ionization energy and the affinity energy