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Bell Work

Bell Work. What is the electron configuration for an element with atomic number 47? If you missed yesterday – What group are the following elements in? Li, K, P, N, Ne, Al, Be, and Br. Physical Science – Lecture 36. Valence Electrons. Remember: Each s gets 2 electrons.

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Bell Work

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  1. Bell Work • What is the electron configuration for an element with atomic number 47? • If you missed yesterday – What group are the following elements in? • Li, K, P, N, Ne, Al, Be, and Br

  2. Physical Science – Lecture 36 Valence Electrons

  3. Remember: Each s gets 2 electrons. Each p gets 6 electrons. Each d gets 10 electrons. Each f gets 14 electrons. Add up the total number of subscripts to determine how many electrons you have.

  4. Electron Orbits • For each orbit around the nucleus, there can be a certain number of electrons in the total orbit. • Remember when we said 2 could be in the first shell and 8 for the 2nd and 3rd shells for the first 18 elements?

  5. Use of the Electron Configuration • The electron configuration can tell you the total number of electrons in an element and the total number of electrons in each shell.

  6. Finding the number of Electrons in each shell • To find the number of electrons in each shell, follow these steps. • Step 1: Write the electron configuration for that element. • Step 2: Count the total number of electrons (superscripts) in each shell with the same large number in front.

  7. Example • 1s22s22p63s23p64s23d10

  8. Example • 1s22s22p63s23p64s23d10 • The first big number is 1. • There is only one sub-shell with the number one. There are two electrons in that subshell. • Therefore, there are two electrons in the first shell.

  9. Example • 1s22s22p63s23p64s23d10 • The second big number is 2. • There are two sub-shells with the number two. There are two electrons in the first subshell and 6 electrons in the second subshell. • Therefore, there are 8 electrons in the second shell.

  10. Example • 1s22s22p63s23p64s23d10 • The third big number is 3. • There are three sub-shells with the number three. There are two electrons in the first subshell, 6 electrons in the second subshell, and ten electrons in the third subshell. • Therefore, there are 18 electrons in the third shell.

  11. Example • 1s22s22p63s23p64s23d10 • The fourth big number is 4. • There is one sub-shell with the number four. There are two electrons in that subshell. • Therefore, there are only 2 electrons in the fourth shell.

  12. What does that look like? • 2 electrons in the first shell, 8 in the second shell, 18 in the third shell, and 2 in the last shell.

  13. How is this helpful? • The number of electrons in the outer energy level corresponds to the number of valence electrons for that element.

  14. Valence Electrons • Equal to the group number • Represents electrons in the outer energy level • Elements want valence electrons equal to noble gases (group 8A)

  15. Valence Electrons • 1A = 1 valence electron • 2A = 2 valence electrons • 3A = 3 valence electrons • 4A = 4 valence electrons • 5A = 5 valence electrons • 6A = 6 valence electrons • 7A = 7 valence electrons • 8A = 8 valence electrons

  16. Electron Dot Structures • Indicates the number of electrons surrounding an element in the outer energy level. • Represents valence shell electrons

  17. Electron Dot Structure Chart (1A) (2A) (3A) (4A) (5A) (6A) (7A) (8A)

  18. Chlorine • What column is chlorine in? • What is the group number? • How many valence electrons does Chlorine have?

  19. Phosphorus • What column is phosphorus in? • What is the group number? • How many valence electrons does phosphorus have?

  20. Oxygen • What column is oxygen in? • What is the group number? • How many valence electrons does oxygen have?

  21. Beryllium • What column is beryllium in? • What is the group number? • How many valence electrons does beryllium have?

  22. Neon • What column is neon in? • What is the group number? • How many valence electrons does neon have?

  23. Potassium • What column is potassium in? • What is the group number? • How many valence electrons does potassium have?

  24. Lithium • What column is lithium in? • What is the group number? • How many valence electrons does lithium have?

  25. Electron Dot Structure Li

  26. Bromine • What column is bromine in? • What is the group number? • How many valence electrons does bromine have?

  27. Electron Dot Structure Br

  28. GAME TIME! • Winning Team gets a 100, second place gets a 90, third place gets 80. • Non-participants get a 60.

  29. Directions • For each slide, first draw the correct elemental symbol for the given name of the element; • Then, clearly draw the correct number of electrons around the symbol. • If I cannot see the electrons, they do not count. • Then, write the number of valence electrons out to the side of the elemental symbol.

  30. Nitrogen

  31. Helium

  32. Argon

  33. Oxygen

  34. Hydrogen

  35. Potassium

  36. Magnesium

  37. Aluminum

  38. Krypton

  39. Sodium

  40. Chlorine

  41. Sulfur

  42. Silicon

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