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Verified answer
a) elektron terakhir = 3d6konfigurasi elektron = 1s2 2s2 2p6 3s2 3p6 4s2 3d6
no atom = 26
b) elektron terakhir = 4s2
konfigurasi elektron = 1s2 2s2 2p6 3s2 3p6 4s2
no atom = 20
c) elektron terakhir = 2p3
konfigurasi elektron = 1s2 2p3
no atom = 5