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Explain how ydrogen differs from alkali ...

Explain how ydrogen differs from alkali metals on the basis of ionisation energies.

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Ionisation energy of hydrogen is very high in comparison to that of alkali metals, for example,ionisation energy of H is 1312 Kj/mol wheras that of Li is 520 kJ/mol.
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Knowledge Check

  • Why the alkali metals have low ionisation enthalpies ?

    A
    Because of small atomic size
    B
    Because of high nuclear charge
    C
    Because of large atomic size
    D
    Because of large atomic number

  • First ionisation energy of alkali metals is very low but second ionisation energy is very high because

    A
    alkali metals acquire noble gas configuration after losing one electron
    B
    a large amount of energy is required to remove electron from a cation
    C
    alkali metals can form only univalent ions
    D
    first group elements can lose only one electron.

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