Presentation on theme: "Bohr Models and Lewis Dot Structures. Recall that electrons are NOT in the nucleus of the atom! A VERY simple way to think about the positions of atoms."— Presentation transcript:
Recall that electrons are NOT in the nucleus of the atom! A VERY simple way to think about the positions of atoms are in terms of energy levels. Energy Levels –Closest to nucleus Lower energy level –Farthest from nucleus Higher energy level Each energy level can hold only a certain number of electrons.
Energy Levels hold certain numbers of Electrons. All of the energy levels together are called the electron cloud. First Energy Level –Can hold 2 electrons Second Energy Level –Can hold 8 electrons Third Energy Level –Can hold 8 electrons Fourth Energy Level –Can hold 8 electrons
Let’s Draw a Picture of an Argon Atom. You know how many protons, electrons, & neutrons are in an atom of any element. Now, draw it. How many e- are in the … First Energy Level? Second? Third? Fourth? This is called a Bohr Model!! 18P 14N
Notice how the Electrons come in pairs? ALWAYS FILL THEM IN as such: –Up, down, side, side. Up, down, side, side.
Bohr Models We call this model the Bohr Model, after Neils Bohr who developed it in 1915.
BOHR MODEL It has a circle in the center, which represents the nucleus. We write the number of protons and neutrons in this circle. The rings surrounding the circle are the energy levels. We draw electrons on the energy levels.