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Verified answer
Jumlah proton = elektron dan massa atom itu = proton + neutronklor = 17,35,17,17,18.
magnesium= 12, 12 bawah Mg 24 atas, 12.
kalium = 39, 19 bawah K 39 atas, 19,19.
kobalt= 27,59, 27 bawah Co 59 atas.