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elektron terakhir : 4d5 --> n=4, l=2, m=2, s=+1/2
50Y = [36Kr] 5s2 4d10 5p2
elektronterakhir : 5p2 ---> n=5, l=1, m=0, s=+1/2
14C = [10Ne] 3s2 3p2
elektron terakhir : 3p2 --> n=3, l=1, m=0, s=+1/2