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∆iH1 value of Mg is more as compared to that of Na while its ∆iH2 value is less. Explain.

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∆iH1 value of Mg is more as compared to that of Na while its ∆iH2 value is less. Explain. 

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∆iH1 value of Mg is more than that of Na due to greater symmetry and smaller size. But ∆iH2 value of Na is higher because Na+ ion has the configuration of noble gas element neon while Mg+ ion does not have a symmetrical configuration. 

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