In a period, the elements having least melting point are :

noble gas

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alkali metals

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chalcogens

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pnictogens

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Solution

The correct option is A noble gas
In period from left to right boiling point and melting point first increases then decreases.

Alkali metals – Crystal structure BCC (low boiling point & melting point)

Transition metals – Crystal structure FCC (High boiling point & melting point)

Inert gases – Lowest boiling point & melting point (Van der Waals' force)

Transition elements – Highest melting point

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Which noble gas has the lowest melting and boiling points of all the elements?

In case of noble gases the general trend in the melting points and boiling points, down the group, is

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