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The s-block Elements — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryThe s-block Elements1 Mark
MCQ
Among the alkali metals $Cs$ is the most reactive because :
  • ✓
    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
    its outermost electron is more loosely bound than the outermost electron ofthe other alkali metals
✓

Answer

Correct option: A.
its incomplete shell is nearest to the nucleus
Among the alkali metals, $Cs$ is the most reactive because its outermost electron is more loosely bound than the outermost electron of the other alkali metals. This is due to the increase in distance between the outermost electron shell and the nucleus.

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