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Bohr Models are NOT Boring!

Bohr Models are NOT Boring!. How to Draw Bohr Diagrams. Bohr Diagrams. Find the 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. Find out which period (row) your element is in. 1

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Bohr Models are NOT Boring!

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  1. Bohr Models are NOT Boring! How to Draw Bohr Diagrams

  2. Bohr Diagrams • Find the 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. 1 2 3 4 5 6 7 • 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 inside. Write the number of Protons and Neutrons the element has inside the nucleus. Put a + by the P and a little 0 by the N. C P+ = 6 N0 = 6 Note: Round mass to nearest 1 when figuring neutrons.

  5. The electron shells surrounding the nucleus each hold a particular number of electrons. Shells are named with letters: 1 = K shell = 2 electrons 2 = L shell = 8 electrons 3 = M shell = 8 electrons 4 = N shell = 18 electrons 5-7 = O, P, Q = up to 32 electrons Remember: The outer shell of an atom (no matter what letter) can only hold 8 electrons!

  6. Bohr Diagrams C P+ = 6 N0 = 6 Carbon is in the 2nd period, so it has two energy levels, or shells. Draw the shells around the nucleus.

  7. Bohr Diagrams • Add the electrons. Carbon has 6 electrons. The first shell can only hold 2 electrons. Write the number of electrons that shell holds and e- for electrons an their charge. How many electrons are in the outer shell? C P+ = 6 N0 = 6 2 e-

  8. Bohr Diagrams • Since you have 2 electrons in the first shell, you need to add 4 more. C P+ = 6 N0 = 6 These go in the 2nd shell. Again, write e- and the number of electrons. 2e- 4e-

  9. 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 P+ = 6 N0 = 6 2e- 4e-

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