JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Among the alkali metals caesium is the most reactive because [Jamia Millia Islamia 2008]

(A)Its incomplete shell is nearest to the nucleus
(B)It has a single electrons 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 metalsCorrect

Answer: (D)

Solution

All alkali metals have a single valence electron, so (B) does not distinguish caesium's special reactivity, and caesium's high atomic mass (C) is not itself the reason for its chemical reactivity. Reactivity of alkali metals tracks how loosely the outermost electron is held: caesium has the largest atomic

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Question ID VK-137566