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
Correct Answer: D
Solution :
Alkali metals have a tendency to lose the single valence electron and form positive ions 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.
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