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Among the alkali metals cesium is the mo...

Among the alkali metals cesium is the most reactive because

A

its incomplete shell is nearest to the nucleus

B

it has a single electron in the valence shell

C

it is the heaviest alkali metal

D

the outermost electron is more loosely bound than the outermost electron of the other alkali metals.

Text Solution

Verified by Experts

The correct Answer is:
D
Alkali metals are highly reactive since they have a strong tendency to lose the single valence s-electron to form unipositive ions having inert gas configuration. In case of cesium, the distance of the valence electron is maximum (among the alkali metals) so force of attraction by the nucleus is least, hence it is most reactive.
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Knowledge Check

  • The alkali metals have

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

  • Which is most reactive chemically ?

    A
    Ba
    B
    Ca
    C
    Sr
    D
    Mg

  • Which of the following alkali metal carbonates is the most stable towards decomposition ?

    A
    `Li_2CO_3`
    B
    `Na_2CO_3`
    C
    `K_2CO_3`
    D
    `Cs_2CO_3`

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    Alkali metals do not occur free in nature because:

    The alkali metals with lowest melting point is

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