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The S-Block Elements

Question
CBSEENCH11007131
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The alkaline earth metals are denser and harder than the corresponding alkali metals. Explain ?

Solution

The atoms of alkaline earth elements have smaller size and stronger intermetallic bonds, as compared to alkali metals. Therefore, they are more closely packed in their crystal lattices which account for high density and hardness of these elements.
In general, the density first decreases up to calcium and then increases up to radium. The case for a decrease in density up to calcium is presumably due to less good packing arrangement of constituents in the solid lattice.

Some More Questions From The s-Block Elements Chapter

Why are alkali metals not found in nature?

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?

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