1 How many valence electrons does Na have?

2 What is the valence of Mg?

3 How many valence electrons does oxygen have?

4 What is the valence of Br?

5 How many electrons does Ca have in its outer shell?

6 Sr needs to ____ electrons to become stable.

7 Iodine (I) needs to ______ electrons to become stable.

8 Which noble gas will Ca have an electron configuration similar to when its stable?

9 K electrons will be similar to ____ when stable.

10 Atoms gain or lose electrons to ____.