1. The Bohr Model of the Atom Topic #6

2. EQ How can you identify an element based on the number of electrons and valence electrons?

3. What do we know? Atoms have 2 main parts Atoms have 2 main parts Electron cloud -- contains electrons Electron cloud -- contains electrons Nucleus – contains protons and neutrons Nucleus – contains protons and neutrons Electrons = e- Protons = p+ Neutrons = n 0

4. What do you need to know? There are 7 possible orbitals There are 7 possible orbitals You can determine how many orbitals your model has by looking at what period (row) the element is on You can determine how many orbitals your model has by looking at what period (row) the element is on The orbitals hold a specific number of electrons (which is the same as the atomic number) The orbitals hold a specific number of electrons (which is the same as the atomic number)

5. How many electrons per orbital? Period 1  orbital (ring) 1: 2 e- Period 2  orbital (ring) 1: 2 e- orbital (ring) 2: 8 e- orbital (ring) 2: 8 e- Period 3  orbital (ring) 1: 2 e- orbital (ring) 2: 8 e- orbital (ring) 2: 8 e- orbital (ring) 3: 8 e- orbital (ring) 3: 8 e- Period 4  orbital (ring) 1: 2 e- orbital (ring) 2: 8 e- orbital (ring) 2: 8 e- orbital (ring) 3: 18 e- orbital (ring) 3: 18 e- orbital (ring) 4: 8 e-

6. Information to create a Bohr model Element name and symbol: Magnesium (Mg) Element name and symbol: Magnesium (Mg) Atomic number: 12 Atomic number: 12 Mass number: 24 Mass number: 24 Protons: 12 Protons: 12 Electrons: 12 Electrons: 12 Neutrons: (24 - 12) = 12 Neutrons: (24 - 12) = 12

7. Bohr model for Mg 12p+ 12n

8. Bohr model for Al 13p+ 14n 0

9. Draw the following Bohr models and Lewis Dot Structures Boron Carbon Nitrogen Oxygen Fluorine Boron Carbon Nitrogen Oxygen Fluorine Aluminum Silicon Phosphorus Sulfur Chlorine Aluminum Silicon Phosphorus Sulfur Chlorine