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AIIMS 2016
Exam
AIIMS
Year
2016
Subject
Chemistry
Chapter
Structure of Atom

AIIMS 2016 · Chemistry · Structure of Atom

Assertion : For hydrogen like species, energy of an electron in a...

Assertion : For hydrogen like species, energy of an electron in a particular orbit increases with increase in value of ZZ. Reason : Electronegativity decreases across a period.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

For hydrogen like species, energy of an electron in nth n^{\text{th }} orbit is given by En=−2π2mZ2e4k2n2h2E_n=-\frac{2 \pi^2 m Z^2 e^4 k^2}{n^2 h^2} i.e., En∝Z2E_n \propto Z^2. Electronegativity increases across a period with decrease in size of atoms.
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