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NEETChemistryClassification of Elements and Periodicity in Properties

Why is helium positioned in the p-block of the Periodic Table?

Options

  1. ABecause it has a completely filled valence shell
  2. BBecause it has a high atomic number
  3. CBecause it belongs to the alkali metals
  4. DBecause it has a half-filled valence shell

Correct answer

A. Because it has a completely filled valence shell

Step-by-step solution

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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