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The ionisation energy of alkali metals d...

The ionisation energy of alkali metals decreases from Li to Cs bacause

A

the atomic size increases from Li to Cs

B

The sitance betweenn nucleus and outermost orbital decreases from Li to Cs

C

electropositive character decreases down the group

D

melting point decreases from Li to Cs.

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A
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The electropositive character of alkali metals decreases with an increase in atomic number.

Assertion : Solubilities of alkali metal fluorides and carbonates increase down the group. Reason : Hydration energies of alkali metal halides decrease down the group with increase in size of cations.

Knowledge Check

  • The first ionization enthlpies of alkali metals decreases down the group because of ________.

    A
    increase in atomic number
    B
    increase in atomic size
    C
    increase in screening effect
    D
    all of these

  • The ionization enthalpies of the alkali metals decrease down the group from Li to Cs because :

    A
    The effect of increasing size outweighs the increasing nuclear charge.
    B
    The outermost electron is very well screened from the nuclear charge.
    C
    Both `(a)` and `(b)`.
    D
    none of the above

  • 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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    Lattice energy of alkali metal chlorides follows the order

    Consider the following statement I.Transition element have almost same ionisation energy II.Alkali metals lowest and inert gases have the highest ionisation energy in a period III.Among all known elements He has the highest and Cs has the lowest ionisation energy Select the correct statement

    The first ionisation energies of alkaline earth metal are higher than those of the alkali metals. This is because:

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    In view of their low ionisation energies the alkali metals are

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