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