Question

Alkali metal donot form di positive ion.why?

Answer 1

Hello!

Here is your answer!
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Alkali metals are members of Group I. They have only one electron in their outermost energy levels. To be stable they need to lose only that single electron in the outermost energy level thus forming monopositive ions.

Also  1st group elements having 1 valence electron in their outermost shell.

so they don't form dipositive ions.

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Hope it helps!