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Bohr Diagrams

Learn how to draw and understand electron configurations using Bohr diagrams for the first 20 elements. Find your element on the periodic table, determine the number of electrons, draw the nucleus, add shells, and fill in valence electrons. Practice with examples.

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Bohr Diagrams

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  1. 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.

  2. 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

  3. Bohr Diagrams • Draw a nucleus . Indicate the number of protons and neutrons. • Carbon is in the 2nd period, so it has two energy levels, or shells. • Draw the shells around the nucleus. 6+ 6 n

  4. Valence Electrons • Each electron shell can hold a certain number of electrons • Electron shells are filled from the inside out • Noble Gases have full outer electron shells • All other elements have partiallyfilled outer electron shells

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

  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 on the right side and going counter clock-wise. C

  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 18, but the elements in the first few periods only use 8 electrons. C

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

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

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

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

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

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

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

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

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