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The S-Block Elements

Question
CBSEENCH11007082
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Why the melting point of sodium is lesser than that of lithium?

Solution
It is because Li atom is smaller than Na atom. The forces holding the lithium atoms in its crystals are stronger than the forces holding the Na atoms in solid sodium. Thus, more enthalpy and high temperature are required for melting of lithium than in the case of sodium.

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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