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Alkali metals have low density because of their:

ASmall size
BHigh charge
CHeavy nuclei
DLarge size
Answer & Solution
Correct answer: D. Large size
1. The atoms are big for their mass. 2. That spreads the mass over more volume. 3. So the large size gives low density. _Source: syllabus Chemistry Part II, Unit 10, The s-Block Elements._
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