Question

2nd ionization energies of alkali metals are very-2 high Account for it ​

Answer 1

Explanation:

Alkali metals are those metals having one electron in the outer most shell .Gp 1 atoms are alkali metals having electronic configuration ns^1 .first ionisation energy is low as after losing one electron that cationic species will achieve noble gas configuration which provides stability to it.

But if we try to romove an electron from the species which is stable then it will require large amount of energy for that.That's why first ionisation energy of alkali metals is low and second ionisation energy is high .

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Answer 2

Explanation:

Alkali metals contain only one valence electron.On loosing this electron, these metals attain noble gas configuration. Therefore, the removal of second electron requires huge amount of energy.Hence, the second ionization energy of alkali metals is very high.

On the other hand, alkaline earth metals contain 2 valence electrons.On loosing the second electron, these metals attain noble gas configuration.Hence, the second ionization energy of alkaline earth metals is low.