12 - Mg, 8 - Oksigen, 45 - Brom, 34, 5 - tembaga, 146 - Uranium, 20 - Kalium, 39 - galium, 48 - Rubidium, 41 - selenium, 125 - polonium, 22, 30,

berapa jumlah neutron unsur berikut

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