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The alkali metals have low melting point...

The alkali metals have low melting point. Which of the following alkali metal is expected to melt if the room temperature rises to `30^(@)C` ?

A

`Na`

B

K

C

`Rb`

D

`Cs`

Text Solution

Verified by Experts

The correct Answer is:
D
The energy binding the atoms in the crystal lattice of the alkali metals is low dur to their large atomic radii and espectially due to the presence of one valence electron per metal atom as compared to large number aviable vacant orbitals. Hence, alkali metals have low melting and boiling points. The melting point of alkali metals decreases from Li to Cs as cohesive force decreases with increase in atomic size. Melting point of `Cs = 302 Ki.e., 29^(@)C`
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