Give brief information on Ionization Enthalpy and Hydration Enthalpy o

1.	Give brief information on Ionization Enthalpy and Hydration Enthalpy of alkali metal (Group I).
Answer» SOLUTION :The ionization enthalpies of the alkali metals are considerably low and decrease down the group from Li to CS. This is because the effect of increasing size OUTWEIGHS the increasing nuclear charge, and the outermost ELECTRON is very well screened from the nuclear charge. The hydration enthalpies of alkali metal ions decrease with increase in ionic sizes. `Li^(+) gt Na^(+) gt K^(+) gt Rb^(+) gt Cs^(+)` `Li^(+)`has maximum degree of hydration and for this REASON lithium salts are mostly hydrated, e.g.,LiCl. `2H_(2)O`

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