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Asked in ETEA MDCAT 2016 2016

What are the values of principal quantum number and azimuthal quantum number for the last electron in Chlorine atom?

Correct answer: C. 3.1

  • A. 1.6
  • B. 1.3
  • C. 3.1
  • D. 6.1

Explanation

The electronic configuration of chlorine is [Ne]3s23p5, indicating that the last electron is in the 3p subshell. The principal quantum number (n) for this electron is 3, corresponding to the third energy level. The azimuthal quantum number (l) is 1 for the p orbital. Options A, B, and D are incorrect because they do not match the quantum numbers for chlorine's last electron.

This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.

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About Quantum Numbers

Quantum numbers describe an electron's energy level, subshell, orbital orientation and spin. You examine the principal, azimuthal, magnetic and spin quantum numbers, their allowed values, orbital capacity and how they determine electronic configurations and distinguish electrons within an atom.

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