Chapter 6, Problem 69E

(a)

Interpretation Introduction

To determine:

The experimental evidence for the electron having a spin.

(b)

Interpretation Introduction

To determine:

An energy level diagram that shows the relative energetic positions of a $1\text{s}$ orbital and a $\text{2s}$ orbital having two electrons in the $1\text{s}$ orbital.

(c)

Interpretation Introduction

To determine:

A diagram with an arrow that shows the excitation of an electron from the $1\text{s}$ orbital to the $\text{2s}$ orbital.