1. Hydrogen (H): Protons = 1, Neutrons = 0, Electrons = 1, Mass Number = 1
2. Helium (He): Protons = 2, Neutrons = 2, Electrons = 2, Mass Number = 4
3. Lithium (Li): Protons = 3, Neutrons = 4, Electrons = 3, Mass Number = 7
4. Beryllium (Be): Protons = 4, Neutrons = 5, Electrons = 4, Mass Number = 9
5. Boron (B): Protons = 5, Neutrons = 6, Electrons = 5, Mass Number = 11
6. Carbon (C): Protons = 6, Neutrons = 6, Electrons = 6, Mass Number = 12
7. Nitrogen (N): Protons = 7, Neutrons = 7, Electrons = 7, Mass Number = 14
8. Oxygen (O): Protons = 8, Neutrons = 8, Electrons = 8, Mass Number = 16
9. Fluorine (F): Protons = 9, Neutrons = 10, Electrons = 9, Mass Number = 19
10. Neon (Ne): Protons = 10, Neutrons = 10, Electrons = 10, Mass Number = 20
11. Sodium (Na): Protons = 11, Neutrons = 12, Electrons = 11, Mass Number = 23
12. Magnesium (Mg): Protons = 12, Neutrons = 12, Electrons = 12, Mass Number = 24
13. Aluminum (Al): Protons = 13, Neutrons = 14, Electrons = 13, Mass Number = 27
14. Silicon (Si): Protons = 14, Neutrons = 14, Electrons = 14, Mass Number = 28
15. Phosphorus (P): Protons = 15, Neutrons = 16, Electrons = 15, Mass Number = 31
16. Sulfur (S): Protons = 16, Neutrons = 16, Electrons = 16, Mass Number = 32
17. Chlorine (Cl): Protons = 17, Neutrons = 18, Electrons = 17, Mass Number = 35
18. Argon (Ar): Protons = 18, Neutrons = 22, Electrons = 18, Mass Number = 40
19. Potassium (K): Protons = 19, Neutrons = 20, Electrons = 19, Mass Number = 39
20. Calcium (Ca): Protons = 20, Neutrons = 20, Electrons = 20, Mass Number = 40
Parent Tip: Review the logic above to help your child master the concept of subatomic particle worksheet.
