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Atomic Models Bohr Model Cloud Model. Bohr Model l Electrons orbit the nucleus in definite orbits. l The orbits can hold only a specific number of electrons.

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Presentation on theme: "Atomic Models Bohr Model Cloud Model. Bohr Model l Electrons orbit the nucleus in definite orbits. l The orbits can hold only a specific number of electrons."— Presentation transcript:

1 Atomic Models Bohr Model Cloud Model

2 Bohr Model l Electrons orbit the nucleus in definite orbits. l The orbits can hold only a specific number of electrons. l Once a level is full, the electrons start filling the next level.

3 Electron Level Limits: l 1st Level = 2 electrons l 2nd Level = 8 electrons l 3rd Level = 8 electrons

4 Hydrogen: + -

5 Helium:

6 Lithium:

7 Beryllium

8 Cloud Model: l The electrons are in an area around the nucleus called an electron cloud. l There are enough electrons to make the atoms charge neutral

9 Hydrogen: 1P 0N 1E

10 Helium: 2P 2N 2E

11 Lithium 3P 3N 3E

12 Assignment: l Draw a Bohr Model and a Cloud Model for the first 18 Atoms on the Periodic Chart. l Include the Atomic Number and Mass. l You may write rather than draw the number of protons and neutrons there are in the nucleus, but draw all electrons for the bohr model.


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