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Choose the alkali metal with highest reactivity among the following
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The correct answer is:
Cs
Among alkali metals (group-1), Cs is most reactive because of its lowest ionisation energy (1E, or \(\Delta_i H_1\))
Note \(\mathrm{Fr}\) is not considered as it is radioactive.
Note \(\mathrm{Fr}\) is not considered as it is radioactive.
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