2. Reading the Periodic Table

7. What does Atomic Mass tell us?

8. QUESTION… How could you find the number of neutrons??? Answer: Atomic # # of neutrons Atomic mass (rounded)

9. Lets give it a Try! How many protons, electrons, and neutrons does Ne have? 10 p + 10 e - 10 n 0

10. Let’s Practice… Find the number of p +, e -, and n for each element: 1. H 2. He 3. Tb 1 p + 2 p + 65 p + 1 e - 2 e - 65 e - 0 n 2 n 94 n

11. Class Work… Find the number of p +, e -, and n for each element: 1. Si 2. Hg 3. Fe 4. Ta 5. Pt

13. Protons (+): Atomic Number Neutrons: Atomic Mass minus Protons Electrons (-): Same number as Protons

14. Protons (+): Atomic Number Neutrons: Atomic Mass minus Protons Electrons (-): Same number as Protons

15. Protons (+): Atomic Number Neutrons: Atomic Mass minus Protons Electrons (-): Same number as Protons

16. Atomic Particles ParticleLocation Mass in amuCharge Proton Neutron Electron

17. Atomic ParticlesParticleLocation Mass in amuChargeProton Neutron Electron What is amu???? amu is short for atomic mass unit

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

19. Atomic Inventory ElementSymbolAtomicNumber Mass Number ProtonsNeutronsElectrons He Mg Fe Ar 2 12 26 18 4 24 56 40 2 12 26 18 2 12 30 22 2 12 26 18 Helium Magnesium Iron Argon

20. 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

21. 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