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jumlah kulit = periode
maka unsur x berada di golongan IVA periode 3
unsur X = Ge
no atom germanium = 32
no massa = 32 + 14 = 46
maka konfigurasi nya = 2 8 4
nomor atom = elektron = 2 + 8 + 4
=14
jumlah neutron =14
maka
Nomor masssa = nomor atom + jumlah neutron
= 14 + 14
= 28
semoga dapat membantu yah kak