A) its incomplete shell is nearest to the nucleus
B) its 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 :
The outermost shell electron of cesium is more loosely bound than the outermost shell electron of the other alkali metals thats why cesium is most reactive among the alkali metals.
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