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Nomor atom = proton = 26
neutron = Nomor massa - proton
neutron = 56 - 26
neutron = 30
Pada atom besi netral
Jmlh proton = jmlh elektron = 26
Pada ion besi^{3+} berarti atom besi melepas 3 elektron agar stabil => jmlh elektron dikurangi 3
elektron = 26 - 3 = 23
Jumlah proton = 26
Jumlah neutron = 30
Jumlah elekteon = 23
Jawaban : B