~Read the Problem-Solving Lab 6-1 on page 149 of your book
~Answer the Thinking Critically questions:
1. What is the neutron number for A? For B?
2. Which diagram represents an isotope of beryllium? Explain how you were able to tell.
3. How many electrons are present in atoms A and B? Explain how you were able to tell.
4. How many energy levels would be present for A and B? How might the electrons in A and B distributed in these energy levels?