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a= 8 = 2 6 = anion -2
b= 11 = 2 8 1 = kation +1
c = 14 = 2 8 4 = kation +4 atau anion -4
d = 15 = 2 8 5 = anion -3
e = 2 8 6 = anion -2
f = 2 8 7 = anion -1
jika a dan b digabung = ab2
a dan c = a4c2 dst