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b. 12mg2+ = 1s2 2s2 2p6 (muatannya 10)
c. 13al3+ = 1s2 2s2 2p6 (muatannya 10)
d. 37rb+ = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 (muatannya 36)