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7
7 protonów
7 elektronów
8 neutronów
[2, 5]
40Ca
20
20 protonów
20 neutronów
20 elektronów
[2, 8, 8, 2]
42Ca
20
20 protonów
20 elektronów
22 neutronów
[2, 8, 8, 2]
36Ar
18
18 protonów
18 elektronów
18 neutronów
[2, 8, 8]
40Ca
18
18 protonów
18 elektronów
22 neutronów
[2, 8,8]