1. How to Draw Bohr Diagrams 7 th Grade Science

2. Bohr Diagrams 1)Find your element name and symbol on the periodic table. 2)Identify the atomic # and atomic mass 3)Determine the number of protons, neutrons, and electrons in an atom of that element.

3. Bohr Diagrams Find out which period (row) your element is in. Elements in the 1 st period have one energy level. Elements in the 2 nd period have two energy levels, and so on. www.chem4kids.com

4. Bohr Diagrams P = ___ N = ___ P = ___ N = ___ 1)Draw a nucleus in the center. 2)Draw the shells around the nucleus. Carbon is in the 2 nd period, so it has two energy levels, or shells.

5. Bohr Diagrams 1)Write in the # of P’s and N’s in the nucleus 2)Add the electrons. A.Carbon has 6 electrons. B.The first shell can only hold 2 electrons. P = _6_ N = _6_ P = _6_ N = _6_

6. Bohr Diagrams C.Since you have 2 electrons already drawn, you need to add 4 more. D.These go in the 2 nd shell. E.Add one at a time - starting on the right side and going counter clock-wise. P = _6_ N = _6_ P = _6_ N = _6_

7. Bohr Diagrams 1)Check your work. 2)You should have 6 total electrons for Carbon. 3)Only two electrons can fit in the 1 st shell. 4)The 2 nd shell can hold up to 8 electrons. 5)The 3 rd shell can hold 18, but the elements in the first few periods only use 8 electrons. P = _6_ N = _6_ P = _6_ N = _6_

8. Bohr Diagrams Try the following elements on your own: a)H b)He c)O d)Al e)Ne f)K P = ___ N = ___ P = ___ N = ___

9. Bohr Diagrams Try the following elements on your own: a)H – 1 electron b)He c)O d)Al e)Ne f)K P = _1_ N = _0_ P = _1_ N = _0_

10. Bohr Diagrams Try the following elements on your own: a)H b)He - 2 electrons c)O d)Al e)Ne f)K P = _2_ N = _2_ P = _2_ N = _2_

11. Bohr Diagrams Try the following elements on your own: a)H b)He c)O - 8 electrons d)Al e)Ne f)K P = _8_ N = _8_ P = _8_ N = _8_

12. Bohr Diagrams Try the following elements on your own: a)H b)He c)O d)Al - 13 electrons e)Ne f)K P = ___ N = ___ P = ___ N = ___

13. Bohr Diagrams Try the following elements on your own: a)H b)He c)O d)Al e)Ne - 10 electrons f)K P = _10_ N = _10_ P = _10_ N = _10_

14. Bohr Diagrams Try the following elements on your own: a)H b)He c)O d)Al e)Ne f)K - 19 electrons P = _19_ N = _20_ P = _19_ N = _20_

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