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Which of the alkali metals is having least melting point? Justify.

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Which of the alkali metals is having least melting point? Justify.

(a) Na 

(b) K 

(c) Rb 

(d) Cs

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(d) Cs. 

As the atomic size of the metal increases, the strength of metallic bonding decreases and hence its melting point decreases. Since the size of Cs is the largest, therefore its melting point is the lowest.

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