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The S-Block Elements

Question
CBSEENCH11007102
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Account for the following:
(i) Lithium can not form monovalent cation (Li+) easily.
(ii) Lithium iodide is more covalent than lithium fluoride.

Solution

(i) The ionisation enthalpy of lithium is maximum in the group. Therefore, it can not form monovalent cation (Li+) so easily as compared to the other alkali metals.
(ii) According to Fajan rule, Li+ ion can polarise I– ion more than the ion because of the bigger size of the anion. Therefore, lithium iodide has more covalent character than lithium fluoride.

Some More Questions From The s-Block Elements Chapter

Lithium shows similarities to magnesium in the chemical behaviour. What is the cause of this similarity?

What is the nature of lithium compounds?

Group 1 elements are called alkali metals. Why?

Why caesium can be used in photoelectric cell while lithium can not be?

In aqueous solution, Li+ ion has lowest mobility. Why?

Lithium has highest ionisation energy in group 1 elements, yet it is strongest reducing agent. Comment.

The softness of group 1 elements increases down the group with increasing atomic number. Give reason. 

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

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