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Because the s-orbital holds only two electrons, the s-block has groups numbering:
ATen
BTwo
CFour
DSix
Answer & Solution
Correct answer: B. Two
1. Each group adds one electron to the outer s-orbital.
2. That orbital is full after two.
3. So groups 1 and 2 make up the s-block.
_Source: NCERT Class 11 Chemistry Part II, Unit 10, The s-Block Elements._
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