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1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵
Jumlah elektron = 2 + 2 + 6 + 2 + 6 + 2 + 5 = 25
jumlah elektron = nomor atom, berarti nomor atomnya = 25
neutron = 30
Neutron = Nomor massa - Nomor atom
30 = Nomor massa - 25
Nomor massa = 30 + 25
Nomor masa = 55
Ok?