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Give any 4 properties of group -18 eleme...

Give any 4 properties of group `-18` elements.

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(i) Electronic configuration `- ns^(2)np^(6)` except helium `(1s^(2))`
(ii) Atomic radii increase down the group.
(iii) They have high ionization enthalpy values.
(iv) They have zero electron gain ethalpy values.
(v) They have low melting and boiling points due to weak Van der Waals. forces. Helium has lowest boiling points. (4.2 K)
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