How the ionization energy varies in alkali metals?
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Ionization energy increases from bottom to top within a group, and increases from left to right within a period. The trend within a group can be seen easily by observing how the ionization energies vary for either the alkali metals (Li through Cs) or the noble gases (He through Rn).
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Going down the group, the first ionisation energy decreases. ... Generally the melting point of the alkali metals decreases down the group. This is because as the ions get larger the distance between the bonding electrons and the positive nucleus gets larger and reduces the overall attraction between the two.
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