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Cl^- : 1s^2 2s^2 2p^6 3s^2 3p^6 (elektron 17)
Ca^2+ : 1s^2 2s^2 2p^6 3s^2 3p^6 (elektron 20)
O^2- : 1s^2 2s^2 2p^6 (elektron 8)
Al^3+ : 1s^2 2s^2 2p^6 (elektron 13)
Ca2+ = 1s^2 2s^2 2p^6 3s^2 3p^6
O2- = 1s^2 2s^2 2p^6
Al3+ = 1s^2 2s^2 2p^6
dimna unsurnya mempunyai muatan berarti harus dalam keadaan Stabil