Second ionisation energy of alkali metal is very high. Explain
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Alkali metals contain only one valence electron. On loosing this electron, these metals attain noble gas configuration. Therefore, the removal of second electron requires huge amount of energy. Hence, the second ionization energy of alkali metals is very high.
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On losing one electron, sodium games noble gas configuration with 10 electrons. Since noble gas configuration is the most stable of all, it is required to provide very high energy to overcome it. While it had readily lost its first electron, second one needs relatively more energy, so ∆iH2 is more than ∆iH1.
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