Question

Li show anomalous behaviour due to .(A )absence of vacant D orbital (b)very very small size (C) very very high ionization energy and least electropositive character (d) all of above
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Answer 1

Answer:

(b)very very small size

Answer 2

Lithium is an example of alkali metal i.e, S-block element. The answer is option D.

Explanation:

Lithium is the first element of group I(alkali earth metals) differs from the rest of the elements of this group in many respects contrary to the expectations. This anomalous behaviour of lithium is due to the following reasons:-

1. It has a very small size than the other alkali metals.
2. Higher polarizing power of lithium-ion results in the increase covalent character of the compound which is responsible for their solubilities in organic solvents.
3. Lithium has high ionisation enthalpy and low electropositive character than other alkali metals.
4. Non-availability of d-orbital in its valence shell.
5. Strong intermolecular bonding.

Thus, the answer is option D).