Educational worksheet covering atoms, isotopes, and ions, including tables for calculating atomic numbers, mass numbers, protons, neutrons, and electrons.

- Selenium: Symbol Se, Atomic # 34, Mass # 80, # Protons 34, # Electrons 34
- Radon: Symbol Rn, Atomic # 86, Mass # 222, # Neutrons 136, # Electrons 86
- Gold: Symbol Au, Atomic # 79, Mass # 197, # Protons 79, # Neutrons 118
- Sodium: Symbol Na, Atomic # 11, Mass # 23, # Protons 11, # Electrons 11
- Uranium-235: Name Uranium, Atomic # 92, Mass # 235, # Protons 92, # Neutrons 143, # Electrons 92
- Uranium-238: Name Uranium, Atomic # 92, Mass # 238, # Protons 92, # Neutrons 146, # Electrons 92
- Carbon-12: Symbol C, Atomic # 6, Mass # 12, # Protons 6, # Neutrons 6, # Electrons 6
- Carbon-13: Symbol C, Atomic # 6, Mass # 13, # Protons 6, # Neutrons 7, # Electrons 6
- Aluminum ion: Name Aluminum, Atomic # 13, Mass # 27, # Protons 13, # Electrons 10, Cation
- Iron ion: Symbol Fe, Atomic # 26, Mass # 56, # Protons 26, # Neutrons 30, Cation
- Phosphide ion: Name Phosphorus, Symbol P, Atomic # 15, Mass # 30, # Electrons 18, Anion
- Fluoride ion: Name Fluorine, Atomic # 9, Mass # 19, # Protons 9, # Neutrons 10, # Electrons 10, Anion