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1. N memiliki Nomor Atom 7 dan Nomor Massa 14
2. Ca memiliki Nomor Atom 20 dan Nomor Massa 40
Jawab :
1. N → Nomor Atom = 7
Nomor Massa = 14
Jumlah neutron = Nomor Massa - Nomor Atom = 14 - 7 = 7
2. Ca → Nomor Atom = 20
Nomor Massa = 40
Jumlah neutron = Nomor Massa - Nomor Atom = 40 - 20 = 20