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Ca, 20p, 20e, 20n
Pb, 82p, 82e, 125n
J, 53p, 53e, 74n
S2-, 16p, 18e, 16n
Cu2+, 29p, 27e, 35n
Al3+, 13p, 10e, 14n
Cl-, 17p, 18e, 18 n