Valence Electrons and Lewis Dot Diagrams

Explore the concept of valence electrons and Lewis dot diagrams in chemistry. Learn how to identify the number of protons, neutrons, and electrons in an element using Bohr model drawings. Discover the significance of valence electrons in bonding and how to determine the number of valence electrons for different elements.

• Valence Electrons
• Lewis Dot Diagrams
• Bohr Model
• Chemistry
• Elements

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1. REVIEW

2. Bohr Model Drawings Identify the number of Protons, Neutrons, and Electrons in an element. (PEN) Write the number of Protons and Neutrons in the center of the nucleus. Draw the number of electrons in each of the orbitals. (PEN)

3. Energy Levels

4. Bohr Model Drawings Carbon P: E: N: P: N:

5. Valence Electrons and Lewis Dot Diagrams

6. Groups Groups or Families: or Families: Vertical Columns of the Periodic Table Period Period or Series: or Series: Horizontal Rows of the Periodic table

7. Valence electrons Valence electrons farthest away from the nucleus. Every group of elements will have a different number of valence electrons electrons are the

8. Why are valence electrons important? Valence electrons are key to whether or not an atom bonds with another atom The number of valence electrons is the face an atom shows to other atoms One way to show valence electrons is with electron dot diagrams or Lewis dot diagrams

9. Lewis dot diagrams Lewis dot diagrams include the symbol for the element surrounded by dots. Each dot stands for one valence electron Hydrogen Hydrogen H Nucleus

10. How to find the # of valence electrons Find out which group (column) your element is in. This will tell you the number of valence electrons your element has. You will only draw the valence electrons.

11. Groups Elements in group 1 will have only 1 valence electron Group 1 = 1 electron

12. Groups Elements in group 2 will have only 2 valence electron Group 2 = 2 electrons

13. Groups Elements in group 3 will have only 3 valence electron Group 3 = 3 electrons

14. Groups Elements in group 4 will have only 4 valence electron Group 4 = 4 electrons

15. Groups Elements in group 5 will have only 5 valence electron Group 5 = 5 electrons

16. Groups Elements in group 6 will have only 6 valence electron Group 6= 6 electrons

17. Groups Elements in group 7 will have only 7 valence electron Group 7 = 7 electrons

18. Groups Elements in group 8 will have only 8 valence electron Group 8 = 8 electrons Except for He, it has 2 electrons

19. Groups - Review Group 8 = 8 electrons Group 1 = 1 electron Except for He, it has 2 electrons Group 2 = 2 electrons 3, 4, 5, 6, 7

20. How to: Lewis Structures 1) Find your element on the periodic table. 2) Determine the number of valence electrons. 3) This is how many electrons you will draw. 4) Draw them starting at the right, and in a counterclockwise manner.

21. Lewis Structures 1) Write the element symbol. C

22. Lewis Structures 1) Write the element symbol. 2) Carbon is in the 4th group, so it has 4 valence electrons. C

23. Lewis Structures 1) Write the element symbol. 2) Carbon is in the 4th group, so it has 4 valence electrons. 3) Starting at the right, draw 4 electrons, or dots, counter- clockwise around the element symbol. C

24. Practice!

25. Lewis Structures H

26. Lewis Structures H

27. Lewis Structures P

28. Lewis Structures P

29. Lewis Structures Ca

30. Lewis Structures Ca

31. Lewis Structures Ar

32. Lewis Structures Ar

33. Lewis Structures Cl

34. Lewis Structures Cl

35. Lewis Structures Al

36. Lewis Structures Al

37. Electron Cloud Electron Cloud