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Periodic Table Study Guide

Periodic Table Study Guide. How to Draw Bohr Diagrams. www.middleschoolscience.com 2008. Bohr Diagrams. Find your element on the periodic table. Determine the number of electrons – it is the same as the atomic number. This is how many electrons you will draw. Bohr Diagrams.

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Periodic Table Study Guide

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  1. Periodic Table Study Guide How to Draw Bohr Diagrams www.middleschoolscience.com 2008

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

  3. 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. www.chem4kids.com

  4. Bohr Diagrams • Draw a nucleus with the element symbol, number of protons, & number of neutrons inside. • Carbon is in the 2nd period, so it has two energy levels, or shells. • Draw the shells around the nucleus. C P=6 N=6

  5. Bohr Diagrams • Add the electrons. • Carbon has 6 electrons. • The first shell can only hold 2 electrons. C P=6 N=6

  6. 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 at the top and going clock-wise. C P=6 N=6

  7. Bohr Diagrams • Check your work. • 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 up to 18, but the elements in the first few periods only use 8 electrons. C P=6 N=6

  8. Bohr Diagrams Try the following elements on your own: • H • He • O • Al • Ne • K Cp=6 N=6

  9. Bohr Diagrams Try the following elements on your own: • H – 1 electron • He • O • Al • Ne • K H P=1 N=0

  10. Bohr Diagrams Try the following elements on your own: • H • He - 2 electrons • O • Al • Ne • K He P=2 N=2

  11. Bohr Diagrams Try the following elements on your own: • H • He • O - 8 electrons • Al • Ne • K O P=8 N=8

  12. Bohr Diagrams Try the following elements on your own: • H • He • O • Al - 13 electrons • Ne • K Al P=13 N=14

  13. Bohr Diagrams Try the following elements on your own: • H • He • O • Al • Ne - 10 electrons • K Ne P=10 N=10

  14. Bohr Diagrams Try the following elements on your own: • H • He • O • Al • Ne • K - 19 electrons K P=19 N= 20

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