Question

22. For the following sets of elements, select the element which has the property noted below:
(i)Largest van der Waals radius: O, N, CI, H
(ii) Most positive electron gain enthalpy: Mg, Ne, Ar, N
(iii) Largest screening effect : Na, Cs, Mg, Al​

Answer 1

Answer:

The van der Waals radius is nearly 40% greater than the covalent radius, as it is measured in a non-bonding condition.

In a period, size decreases on going from left to right due to an increase in effective nuclear charge. Thus, alkali metals have large atomic radii and halogens have the smallest size.

The atomic radius of neon is greater than that of fluorine. Halogens have the smallest size in a particular period while noble gases have the largest size, as their van der Waals radius is measured, which is the largest.

When the second electron enters in s-subshell, the nucleus experiences a higher effective nuclear charge and there is more contraction in their size.

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