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 indium ion? Question 3 of 12 Loading… 4. What is the symbol of a barium ion? Question 4 of 12 Loading… 5. How many occupied electron shells does cadmium have? 4 3 2 1 5Question 5 of 12 Loading… 6. How many occupied electron shells does rubidium have? 6 1 7 3 5Question 6 of 12 Loading… 7. How many occupied electron shells does Plutonium have? 7 4 3 1 6Question 7 of 12 Loading… 8. How many occupied electron shells does polonium have? 3 7 4 6 1Question 8 of 12 Loading… 9. How many valence electrons does a neutral atom of radon have? 2 8 3 5 7Question 9 of 12 Loading… 10. How many valence electrons does a neutral atom of tellurium have? 4 6 8 1 7Question 10 of 12 Loading… 11. How many valence electrons does a neutral atom of antimony have? 3 6 4 8 5Question 11 of 12 Loading… 12. How many valence electrons does a neutral atom of helium have? 7 4 2 5 6Question 12 of 12 Loading… Loading…