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  • The melting point of Lithium   is just double the melting point of Sodium <img alt="(90^{0}C)

The melting point of Lithium (101^{0}C)  is just double the melting point of Sodium (90^{0}C) because :

Option: 1

down the group, the hydration energy decreases


Option: 2

down the group, the ionization energy decreases


Option: 3

down the group, the cohesive energy decreases


Option: 4

None of the above


Answers (1)

best_answer

The atom becomes larger on descending the group, so the bonds are weaker (metallic bond), the cohesive force/energy decreases and accordingly melting point also decreases.

Therefore, option(3) is correct.

Posted by

Pankaj Sanodiya

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