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b.21Sc⇔1s2 2s2 2p6 3s2 3p6 4s2 3d1 ev 2
c.16S⇔1s2 2s2 2p6 3s2 3p3 ev 5
d.35Br⇔1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5 ev 7
e.18Ar⇔1s2 2s2 2p6 3s2 3p6 ev 8