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

The first(IE_(1)) and second (IE_(2))Ionization energies (KJ/mol) of a few elements designated by roman numerals are given below.Which of these would be an alkali metal?

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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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