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Bohr Model & Lewis Dot Diagrams

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Bohr Model & Lewis Dot Diagrams

- There are two models of the atoms we will be using in class.
- Bohr Model
- Lewis Dot Structure

- The Bohr Model shows all of the particles in the atom.
- In the center is circles. Each circle represents a single neutron or proton. Protons should have a plus or P written on them. Neutrons should be blank or have an N.
- In a circle around the nucleus are the electrons. Electrons should have a minus sign or an e.

- You can’t just shove all of the electrons into the first orbit of an electron.
- Electrons live in something called shells or energy levels.
- Only so many can be in any certain shell.
- The electrons in the outer most shell of any element are called valance electrons.

- Energy level 3 CAN hold 18, but the elements in the first few periods only use 8!

- How to draw a Lithium atom
- First, look at the Periodic Table
- Second, determine the number of protons (Look @ the atomic number)
- Then determine the number of neutrons (Atomic mass – atomic number)
- Then determine the number of electrons (Look @ the atomic number)

Try the following elements on your own:

- H
- He
- O
- Al
- Ne
- K

- The Lewis Dot Structure is a bit different from the Bohr model.
- It only shows the element symbol and it’s outer most electron shell.

- Step 1: Write the Element Symbol
- Step 2: Find the number of electrons in the last energy level of the Bohr Model (Valence Electrons)
- Step 3: Place the electrons (dots) around the symbol in clockwise order so that there are no more than 2 electrons per side.