Valence Electrons and Ions Practice You will need a Periodic Table for these practice questions. 1. What is the symbol of a chlorine ion? Question 1 of 12 Loading… 2. What is the symbol of a barium ion? Question 2 of 12 Loading… 3. What is the symbol for a magnesium ion? Question 3 of 12 Loading… 4. What is the symbol of a nitrogen ion? Question 4 of 12 Loading… 5. How many occupied electron shells does lithium have? 2 6 3 1 5Question 5 of 12 Loading… 6. How many occupied electron shells does cobalt have? 5 6 1 4 2Question 6 of 12 Loading… 7. How many occupied electron shells does boron have? 4 5 2 1 3Question 7 of 12 Loading… 8. How many occupied electron shells does argon have? 1 3 8 7 5Question 8 of 12 Loading… 9. How many valence electrons does a neutral atom of hydrogen have? 1 3 5 6 8Question 9 of 12 Loading… 10. How many valence electrons does a neutral atom of potassium have? 7 2 3 4 1Question 10 of 12 Loading… 11. How many valence electrons does a neutral atom of carbon have? 4 8 7 1 3Question 11 of 12 Loading… 12. How many valence electrons does a neutral atom of boron have? 3 1 8 2 5Question 12 of 12 Loading… Loading…