2. Atomic Inventory

3. Protons (+) (Atomic Number) Protons (+) (Atomic Number) Neutrons (Atomic Mass minus Protons) Neutrons (Atomic Mass minus Protons) Electrons (–) (Same number as protons) Electrons (–) (Same number as protons)

4. Atomic Particles ParticleLocation Mass in amuCharge Proton Neutron Electron Nucleus Cloud 1 1 0 +1 0

5. Atomic Inventory ElementSymbolAtomicNumber Mass Number ProtonsNeutronsElectrons He Li Be B 2 3 4 5 4 7 9 11 2 3 4 5 2 4 5 6 2 3 4 5 Helium Lithium Beryllium Boron

6. Atomic Inventory ElementSymbolAtomicNumber Mass Number ProtonsNeutronsElectrons Zn Br Al U 30 35 13 92 65 80 238 30 35 13 92 35 45 14 146 30 35 13 92 Zinc Bromine Aluminum Uranium 27

7. Atomic Inventory ElementSymbolAtomicNumber Mass Number ProtonsNeutronsElectrons Na Kr Ca Ag 11 36 20 47 23 84 40 108 11 36 20 47 12 48 20 61 11 36 20 47 Sodium Krypton Calcium Silver