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proton = 7
elektron = 7
Neutron = 14 - 7 = 7
b. Na+ proton = 11
elektron = 11 - 1 = 10
Neutron = 23 - 11 = 12
c. S²-
proton = 16
elektron = 16 + 2 = 18
Neutron = 32 - 16 = 16
d. Ca²+
proton = 20
elektron = 20 - 2 = 18
Neutron = 40 - 20 = 20