Among the alkali metals cesium is the most reactive because

Question

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.

Tardigrade Admin · Accepted Answer

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.

Q. Among the alkali metals cesium is the most reactive because

its incomplete shell is nearest to the nucleus

it has a single electron in the valence shell

it is the heaviest alkali metal

the outermost electron is more loosely bound than the outermost electron of the other alkali metals.

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.