1.

The melting point of lithium (181^(@)C) is just double the melting point of sodium (98^(@)C) because -

Answer»

down the group, the hydration ENERGY DECREASES.
down the group, the ionization energy decreases.
down the group the cohesive energy decreases.
none of these

Solution :The atom becomes LARGER on descending the group, so (metallic bond), the cohe- the bonds becomes WEAK sive force/energy decreases and accordingly melting point also decreases.


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