Valence Electrons and Ions Practice You will need a Periodic Table for these practice questions. 1. What is the symbol of a strontium ion? Question 1 of 12 Loading… 2. What is the symbol of a phosphorus ion? Question 2 of 12 Loading… 3. What is the symbol of a antimony ion? Question 3 of 12 Loading… 4. What is the symbol of a tellurium ion? Question 4 of 12 Loading… 5. How many occupied electron shells does cadmium have? 7 4 1 5 2Question 5 of 12 Loading… 6. How many occupied electron shells does argon have? 1 7 8 3 2Question 6 of 12 Loading… 7. How many occupied electron shells does thallium have? 5 6 1 3 4Question 7 of 12 Loading… 8. How many occupied electron shells does manganese have? 5 2 3 7 4Question 8 of 12 Loading… 9. How many valence electrons does a neutral atom of helium have? 6 2 7 5 1Question 9 of 12 Loading… 10. How many valence electrons does a neutral atom of neon have? 7 1 8 4 2Question 10 of 12 Loading… 11. How many valence electrons does a neutral atom of silicon have? 2 1 4 7 5Question 11 of 12 Loading… 12. How many valence electrons does a neutral atom of sodium have? 1 3 4 2 6Question 12 of 12 Loading… Loading…