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elektron terakhir => 4s1
bilangan kuantum : n: 4, l: 1 m: -1, s: +1/2
b) 25 Mn konfigurasi elektron : 1s2 2s2 2p6 3s2 3p6 4s2 3d5
elektron terakhir => 3d5
bilangan kuantum : n: 3, l: 2, m: +2, s: +1/2
c) 54 Xe konfigurasi elektron 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6
elektron terakhir => 5p6
bilangan kuantum : n: 5, l: 1, m: +1, s: -1/2