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.Which of the alkali metal is having lea...

.Which of the alkali metal is having least melting point?

A

Na

B

K

C

Rb

D

Cs

Text Solution

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Atomic size increases as we move down the alkali group. As a result, the binding energies of their atoms in the crystal lattice decrease Also, the strength of metallic bonds decrease on moving down a group in the periodic table. This causes a decrease in the melting point. Among the given metals, Cs in the largest and has the least melting point.
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  18. .Which of the alkali metal is having least melting point?

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