1. Do Now (Complete in Do Now Tracker) 1.What is the chemical formula for methane? 2. Which part of an the element has the most mass? 3. What is in the nucleus of an atom? 4. Where are the electrons found in an atom? Today’s Lesson Topic: Atomic Models

2. Exit Ticket Scores

3. Wait, the atom is so small It cannot be broken down any more

4. Practice: Bohr’s Model of the Atom Today’s Objective: SWBAT to describe the structure and arrangement of atomic particles in the Bohr Model

5. Bohr Model Starter: What do you picture when you think of an atom? (What does it look like?) Answer the question in the space provided as a Think-Pair-Share

6. Compare and Contrast Bohr Model “Planetary Model” Schrödinger Model “Electron Cloud Model”

7. Bohr’s Atomic Theory  Bohr put the electrons in certain circular orbits around the nucleus called shells.  The Shells indicate different energy levels. +

8. Bohr’s Atomic Theory  Protons and neutrons are found in the nucleus.  Electrons orbit the nucleus in various shells.  Everything else is empty space. + 1 st shell 2 nd shell 3 rd shell Nucleus Empty space 0

9. Bohr’s Atomic Theory  Each of the shells has a maximum number of electrons that it can hold. + 1 st shell 2 nd shell 3 rd shell Nucleus Empty space 2 electrons 8 electrons 18 electrons

10. Bohr’s Atomic Theory Ex.1)Draw a Bohr model of Hydrogen-1. Step-1 Draw a circle to represent the nucleus. Step-2 Determine the number of protons and neutrons and place them in the nucleus. Step-3 Draw a circle around the nucleus to represent the electron shell. Step-4 Place the electron in the shell. H-1 1p 0n e-e-

11. Bohr’s Atomic Theory Ex.2)Draw a Bohr model of Helium-2. Step-1 Draw a circle to represent the nucleus. Step-2 Determine the number of protons and neutrons and place them in the nucleus. Step-3 Draw a circle around the nucleus to represent the electron shell. Step-4 Place the electron in the shell. Helium-2 2p 2n e-e- e-e-

12. Bohr’s Atomic Theory Ex.3)Draw a Bohr model of Lithium-3. Step-1 Draw a circle to represent the nucleus. Step-2 Determine the number of protons and neutrons and place them in the nucleus. Step-3 Draw circles around the nucleus to represent the electron shells. Step-4 Place the electrons in the shells. Litium-3 3p 4n e-e- e-e- e-e-

13. Bohr’s Atomic Theory Ex.4)Draw a Bohr model of Neon-10. Step-1 Draw a circle to represent the nucleus. Step-2 Determine the number of protons and neutrons and place them in the nucleus. Step-3 Draw circles around the nucleus to represent the electron shells. Step-4 Place the electrons in the shells. Neon-10 10p 10n e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e-

14. Application/Practice Using the Periodic Table you will build the following atoms on your own separate pieces of paper, I will be collecting random one for a grade: Sodium Neon Boron Aluminum Write the elements Name, Atomic #, Protons, Electrons and Neutrons on your paper BEFORE constructing your Bohr model.

15. Connection Complete the following question on the Bohr model that I am collecting How did “building” your atoms help you understand Bohr’s model?

16. Quiz Time! Wait, which side are the reactants vs. the products in a chemical equation?