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The second ionisation enthalpies of alka...

The second ionisation enthalpies of alkaline earth metals are much lower than those of the corresponding alkali metals. Explain.

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The loss of second electron from an alkali metal cation `(M^(+))` causes loss of stable noble gas configuration while the loss of second electron from an alkaline earth metal cation, leads to attainment a very stable noble gas configuration. This explains why the second ionisation enthalpies of alkaline earth metals are much lower than those of the corresponding alkali metals.
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CHHAYA PUBLICATION-s-BLOCK ELEMENTS -HIGHER ORDER THINKING SKILL (HOTS) QUESTIONS
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  14. BaSO4 is insoluble in water whereas BeSO4 is soluble in water - explai...

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  18. Ba^(2+) ions are poisonous, still they are provided to patients before...

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  19. Can sodium hydride be dissolved in water? Justify.

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  20. Why does sodium impart yellow colour in the flame?

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