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X=12 e
X2+=10 e
X2+= 2 8
nomer atom = elektron tpi bisa jga proton jikadalam keadaan atomnya..
maka elektron dar X = 12
1s2 2s2 2p6 3s2
X2+ itu melepaskan 2 elektron = 1s2 2s2 2p6