# 1. What is an atom? The smallest unit of an element that still has all the properties of that element. 2. Where are atoms found? Atoms are found in everything.

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1. What is an atom? The smallest unit of an element that still has all the properties of that element. 2. Where are atoms found? Atoms are found in everything. 3. What particles make up an atom? Atoms are made up of protons, neutrons, & electrons

Describe the three subatomic particles
4. Neutron is subatomic particle found in the nucleus of an atom and has no charge. 5. Proton is a positively charged particle found in the nucleus of an atom. 6. Electron is a negative charged particle that is located around the nucleus.

7. Explain what an electron cloud is.
Area or region around the nucleus of an atom where the electrons are located. 8. Define matter Anything that has mass and takes up space. 9. Lights volume cannot be measured and it has a mass of 0 grams. Is it matter? Explain No, it is not matter because it does not have mass.

Periodic Table Study Guide
How to Draw Bohr Diagrams 6th Grade Science Mr Wegley Borrowed from Mrs. Larosa

Bohr Diagrams Find your element on the periodic table.
Determine the number of protons – it is the same as the atomic number. This is how many protons you will draw in the nucleus.

Bohr Diagrams In the center of the paper draw that many protons. + + +

Bohr Diagrams Then find the number of neutrons by subtracting the number of protons from the atomic mass. 12 – 6 = 6 Add that many neutrons. + N N + N + N + + N + N N

Now for the electrons e-

Bohr Diagrams Find out which period (row) your element is in.
Elements in the 1st period have one energy level. Elements in the 2nd period have two energy levels, and so on.

Bohr Diagrams Each level hold a different amount of electrons.
1st holds 2 2nd holds 8 3rd holds 8 4th holds 18 5th holds 32 6th holds 32 7th holds 18 8th holds 8

Bohr Diagrams Draw a nucleus with .
Carbon is in the 2nd period, so it has two energy levels, or shells. Draw the shells around the nucleus. + N N + N + N + + N + N

Bohr Diagrams Add the electrons. Carbon has 6 electrons.
The first shell can only hold 2 electrons. + N N + N + N + + N + N

Bohr Diagrams Since you have 2 electrons already drawn, you need to add 4 more. These go in the 2nd shell. Add one at a time -starting on the right side and going counter clock-wise. + N N + N + N + + N + N

You should have 6 total electrons for Carbon. Only two electrons can fit in the 1st shell. The 2nd shell can hold up to 8 electrons. The 3rd shell can hold 18, but the elements in the first few periods only use 8 electrons. + N N + N + N + + N + N

Bohr Diagrams Try the following elements on your own: H He O Al Ne K

Bohr Diagrams Try the following elements on your own: H – 1 electron
Al Ne K +

Bohr Diagrams Try the following elements on your own: H
He - 2 electrons O Al Ne K + N N +

Bohr Diagrams O Try the following elements on your own: H He
O - 8 electrons Al Ne K O

Bohr Diagrams O Try the following elements on your own: H He O
Al- 13 electrons Ne K O

Bohr Diagrams Ne Try the following elements on your own: H He O Al
Ne - 10 electrons K Ne

Bohr Diagrams K Try the following elements on your own: H He O Al Ne
K - 19 electrons K

Bohr Diagrams End of Study Guide. You should know how to draw a Bohr Diagram for the first 20 elements.

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