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Why is second ionisation energy of alkal...

Why is second ionisation energy of alkali metals higher than alkaline earth metals?

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Alkali metals acquire, noble gas configuration after losing 1 electron, therefore their second ionization energy is higher than alkaline earth metals.
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Knowledge Check

  • The alkali metals

    A
    show increasing metallic alkali nature from Li to Cs
    B
    from salts which are predominantly covalent
    C
    shoe decreased chemical reactivity with dry oxygen in going from Li to Cs
    D
    shoe increasing electronegativity from Li to Cs.

  • The alkali metals have

    A
    Highest electronegativity
    B
    Largest atomic radii
    C
    Highest density
    D
    Highest ionisation

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    Why are ionic hydrides of only alkali metals and alkaline earth metals are known ? Give two examples.

    Name radioactive alkali and alkaline earth metals.

    Why does ionisation energy of alkali metals decreases with the increase in atomic number?

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