Concept explainers
Why noble gases are nonreactive whereas alkali metals are highly reactive.
Answer to Problem 21Q
Solution:
Noble gases cannot lose or gain outermost electron, hence are nonreactive.
Alkali metals can easily give away outermost electron, hence are very reactive.
Explanation of Solution
How reactive a thing is depending on how easily it can lose or gain electrons in its outermost shell. Noble gases have fully filled outer shells and hence cannot accommodate a new electron or lose an electron. Hence, they are unable to react.
Alkali metals have a loosely bound single electron in the outermost shell which they can give away easily to react with other things. Hence alkali metals are highly reactive.
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