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Jumlah Elektron = 26
Jumlah Proton = elektron = 26
jumlah neutron = Nomer massa - Jumlah proton = 56-26 = 30
Maka jawabnnya
26,26, 30 (C)
jumlah elekton = nomor atom +_ muatan (e = 26)
jumlah neutron = nomor massa - nomor atom (n = 56-26 = 30)