1.

The increase in boiling points of noble gases from He to Xe is due to the

Answer»

decreases in ionization energy
increases in polarizability
increase in ELECTRON affinity
increase in ATOMIC volume.

Solution :As we go down the GROUP from He to Xe, the size of atom increases, due to which ease of polarization of noble GAS atom (or molecule) increases. Xe is 20 times more polarizable than He. The increasing polarizability has its effect on strengthening intermolecular interactions (dispersion forces), which in-turn increases the boiling and MELTING points. Increasing intermolecular attractions also make their liquefaction easier.


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