The s-Block Elements

Question 1
CBSEENCH11006979

What are s-block elements?

Solution
The elements which belong to groups 1 and 2 of the periodic table are called s-block elements.
Question 2
CBSEENCH11006980

Why are alkali metals not found in nature?

Solution

Alkali metal has one electron each in the valence subshell of their atoms. Since they have only one electron in valence subshell, therefore, they lose easily, owing to their low ionisation energies. Therefore, alkali metals are highly reactive chemically and do not exist in the free or native state.

Question 3
CBSEENCH11006981

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

Solution

It is due to similarity in their:
(i) charge/size ratio.   
(ii) ionic sizes.

Question 4
CBSEENCH11006982

What is the nature of lithium compounds?

Solution

These are generally covalent.

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