With the increase in atomic weights,the melti | vedclass

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(B) The melting points of alkali metals decrease as we move down the group due to the decrease in the strength of metallic bonding as the atomic size

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Decrease

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(B) The melting points of alkali metals decrease as we move down the group due to the decrease in the strength of metallic bonding as the atomic size increases.The melting points $(K)$ are as follows:$Li: 453.5 \ K$$Na: 370.8 \ K$$K: 336.2 \ K$$Rb: 312 \ K$$Cs: 301.5 \ K$Thus,with the increase in atomic weight,the melting point decreases.

With the increase in atomic weights,the melting points of the alkali metals:

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