Which of the following is not correct w.r.t. elements of 1st group?

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They are called alkali metals.

They all have one electron in s-subshell of valence shell, i.e., ns1 configuration.

They are very reactive elements.

They have very high ionization enthalpies.

answer is D.

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Detailed Solution

Ionization enthalpies of elements of 1st group are very low which make them very reactive.

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