Question
Chemistry Question on GROUP 1 ELEMENTS
Among the alkali metals cesium is the most reactive because
A
its incomplete shell is nearest to the nucleus
B
it has a single electron in the valence shell
C
it is the heaviest alkali metal
D
the outermost electron is more loosely bound than the outermost electron of the other alkali metals.
Answer
the outermost electron is more loosely bound than the outermost electron of the other alkali metals.
Explanation
Solution
Alkali metals have a tendency to lose the single valence electron and form +ve ion and gain inert gas configuration but in case of cesium, the distance of the valence electron is maximum. So, force of attraction by the nucleus is least, hence, it is more reactive.