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Question: Answered & Verified by Expert
Why is helium positioned in the p-block of the Periodic Table?
ChemistryClassification of Elements and Periodicity in PropertiesNEET
Options:
  • A Because it has a completely filled valence shell
  • B Because it has a high atomic number
  • C Because it belongs to the alkali metals
  • D Because it has a half-filled valence shell
Solution:
2630 Upvotes Verified Answer
The correct answer is: Because it has a completely filled valence shell
Strictly, helium belongs to the s-block but its positioning in the p-block along with other group 18 elements is justified because it has a completely filled valence shell (1s2) and as a result, exhibits properties characteristic of other noble gases.

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