The electronic configuration of Ce 3 + and Nd 3 + has to be written. Concept introduction: The electron configuration tells us in which orbitals the electrons for an element are located. Three rules are, Electrons fill orbitals staring with lowest n and moving upwards(Aufbau principle) No two electrons can fill one orbital with the same spin(Pauli Exclusion Principle) For orbitals within the same subshell, the electrons fill each orbital singly before any orbital gets a second electron (Hund’s rule). Atomic Number is the number of protons in an atom.

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Chapter 22.6, Problem 3CS

Interpretation Introduction

Interpretation:

The electronic configuration of Ce3+ and Nd3+ has to be written.

Concept introduction:

The electron configuration tells us in which orbitals the electrons for an element are located. Three rules are,

Electrons fill orbitals staring with lowest n and moving upwards(Aufbau principle)

No two electrons can fill one orbital with the same spin(Pauli Exclusion Principle)

For orbitals within the same subshell, the electrons fill each orbital singly before any orbital gets a second electron (Hund’s rule).

Atomic Number is the number of protons in an atom.

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