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99 Percentile Qs Bank for JEE MainChemistryp Block Elements (Group 15, 16, 17 & 18)

Assertion : In a period noble gas has smallest atomic radius. Reason : In case of noble gases atomic radii are taken as covalent radii.

Options

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. BBoth Assertion and Reason are true but Reason is NOT the correct explanation of Assertion.
  3. CAssertion is true but Reason is false.
  4. DIf both assertion and reason are false.

Correct answer

D. If both assertion and reason are false.

Step-by-step solution

Helium As we move from Helium represented by the symbol He to radon represented by Rn then atomic radii increases due to increase in the number of shells so we can consider that first member of noble gases i.e. Helium shows the smallest atomic radii. Atomic radius of a noble gas is expressed as van der Waal's radius. Thus, both assertion and reason are false.

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