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

2. Bohr Diagrams 1)Find your element on the periodic table. 2)Determine the number of protons – it is the same as the atomic number. 3)This is how many protons you will draw in the nucleus.

3. Bohr Diagrams 1) In the center of the paper draw that many protons. ++ + + + + +

4. Bohr Diagrams 1)Then find the number of neutrons by subtracting the number of protons from the atomic mass. 2)12 – 6 = 6 3)Add that many neutrons. + + + + + + N N N N N N N

5. Now for the electrons e -

6. 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

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

8. Bohr Diagrams 1)Draw a nucleus with. 2)Carbon is in the 2 nd period, so it has two energy levels, or shells. 3)Draw the shells around the nucleus. + + + + + + N N N N N N

9. Bohr Diagrams 1)Add the electrons. 2)Carbon has 6 electrons. 3)The first shell can only hold 2 electrons. + + + + + + N N N N N N

10. Bohr Diagrams 1)Since you have 2 electrons already drawn, you need to add 4 more. 2)These go in the 2 nd shell. 3)Add one at a time - starting on the right side and going counter clock-wise. + + + + + + N N N N N N

11. 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. + + + + + + N N N N N N

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

13. Bohr Diagrams Try the following elements on your own: a)H – 1 electron b)He c)O d)Al e)Ne f)K +

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

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

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

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

18. Bohr Diagrams Try the following elements on your own: a)H b)He c)O d)Al e)Ne f)K - 19 electrons K K

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