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What is the Pauli exclusion principle? Why is it important when writing electron

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 21Q Chapter 9

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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Problem 21Q

PROBLEM 21Q

What is the Pauli exclusion principle? Why is it important when writing electron configurations?

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Solution 21Q

Pauli Exclusion Principle states that “ no two electrons in an atom can have can have the same four electronic quantum numbers.”

Therefore, two electrons present in the same orbital having same n, l and ml but both the electrons should have opposite spin(ms).Thus,  each orbital can have a maximum of only two electrons, with opposing spins( ms=- ½ and ms=+½ ).

The electron configuration of an atom is the representation of the arrangement of electrons distributed among the orbital shells and subshells.

According to Pauli’s Principle, two electrons occupying in a same orbital should have opposite spin,  otherwise they would have the same four quantum numbers, which is forbidden.

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Chapter 9, Problem 21Q is Solved
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Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

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What is the Pauli exclusion principle? Why is it important when writing electron