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The first (IE(1)) and the second (IE(2))...

The first (`IE_(1)`) and the second `(IE_(2))` ionisation energies (kJ `mol^(-1)`) of a few elements are given below :

Which of the above elements is likely to be
a reactive metal?

Text Solution

Verified by Experts

Reactive metals include alkali metals that have one valence electron. It is evident in element II that the first ionization energy has a small value of `520" kJmol"^(-1)` but the second IE is massively high. So, element II must be an alkali metal.
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