2. Draw Atoms

3. SymbolAtomic No.Mass No.No. of Neutrons N77 F1910 K1939 Co2732 14 9 20 59

4. sulfur atomic number 16 mass number 32 How many protons? 16 How many electrons? 16 How many neutrons? 16 Is this atom an isotope?

5. sulfur atomic number 16 mass number 32 16 p 16 n

6. beryllium atomic number 4 mass number 9 How many protons? 4 How many electrons? 4 How many neutrons? 5 Is this atom an isotope?

7. beryllium atomic number 4 mass number 9 4 p 5 n

8. nitrogen atomic number 7 mass number 14 How many protons? 7 How many electrons? 7 How many neutrons? 7 Is this atom an isotope?

9. nitrogen atomic number 7 mass number 14 7 p 7 n

10. sodium atomic number 11 mass number 23 How many protons? 11 How many electrons? 11 How many neutrons? 12 Is this atom an isotope?

11. sodium atomic number 11 mass number 23 11 p 12 n

12. potassium atomic number 19 mass number 39 How many protons? 19 How many electrons? 19 How many neutrons? 20 Is this atom an isotope?

13. potassium atomic number 19 mass number 39 19 p 20 n

14. argon atomic number 18 mass number 40 How many protons? 18 How many electrons? 18 How many neutrons? 22 Is this atom an isotope?

15. argon atomic number 18 mass number 40 18 p 22 n

16. chlorine atomic number 17 mass number 34 How many protons? 17 How many electrons? 17 How many neutrons? 17 Is this atom an isotope?

17. chlorine atomic number 17 mass number 34 17 p 17 n

18. calcium atomic number 20 mass number 40 How many protons? 20 How many electrons? 20 How many neutrons? 20 Is this atom an isotope?

19. calcium atomic number 20 mass number 40 20p 20 n

20. neon atomic number 10 mass number 22 How many protons? 10 How many electrons? 10 How many neutrons? 12 Is this atom an isotope?

21. neon atomic number 10 mass number 22 10 p 12 n