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Z : nomor atom
Z : nomor atom : jumlah proton : jumlah elektron
A : jumlah proton + neutron
jumlah neutron: A-Z
a. Cl-
p:17
n: 18
e: 17+1 =18
b.Ca2+
p:20
n:20
e:20-2 = 18
c.As3-
p: 33
n: 42
e: 33+3 = 36