1. Making New Connections: Atoms ( ) and the Periodic Table ( )

2. Bohr-Rutherford Model of an Atom energy levels The energy levels that are closest to the nucleus have the least energy and the ones furthest away have the most energy

3. Representing Atoms with Models We represent atoms using Bohr-Rutherford models What is a Bohr-Rutherford model? What information is captured in a Bohr-Rutherford model? 15 p + 16 n 0 Phosphorus atom 15 protons 16 neutrons 15 electrons

4. x p + y n 0 inner most energy level: can hold up to 2 electrons second energy level: can hold up to 8 electrons third energy level: can hold up to 8 valence electrons x protons in the nucleus y neutrons in the nucleus NOTE: # protons = # electrons NOTE: # protons may = # neutrons Representing Atoms with Diagrams

5. Drawing Bohr-Rutherford Models see handout “ Drawing Bohr- Rutherford Models”

6. HydrogenHelium Lithium BerylliumBoronCarbon Practicing Bohr-Rutherford Models

7. Periodic Table of Elements families/groups periods

8. Tips for Remembering Important Details families / groups follow gravity (they all go up and down)

9. +1 -3-3 +2 +3 -2-2 H -1 Be BCNOF He Valence Electrons and the Periodic Table