Monatomic Ions
Elements in Groups 1A, 2A, 6A and 7A that readily form ions either lose
or gain electrons to attain a filled outer level and thus a noble gas configuration.
Their ions are said to be isoelectronic with the nearest noble gas.
Elements in Groups 3A, 4A and 5A form cations via a different process; they attain pseudo-noble gas configurations.
Sn ([Kr]5s24d105p2)
Sn+4 ([Kr]4d10) + 4e-
Sn+2 ([Kr]5s24d10) + 2e-
Sn ([Kr]5s24d105p2)
Main Group
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