Arrangement of e-

1. Arrangement of e- • e- are arranged in ENERGY LEVELS • There are 7 energy levels • Level 1 is closest to the nucleus and has the lowest energy • Level 7 is farthest from the nucleus and has the highest energy

2. Each energy level has sublevels There are 4 types of sublevel: S, P, D, and F

3. Each sublevel has orbitals Orbitals are locations within the atom where the e- are likely to be found Each orbital can hold 2 electrons

4. S sublevel orbitals S orbitals are Spherical shapes There is one S orbital 1 S x 2 e- = 2 e- can fit in S sublevel

5. P sublevel orbitals P orbitals are “peanut” shaped There are 3 P orbitals, one in each dimension. 3 P x 2 e- = 6 e- can fit in P Sublevel

6. D sublevel orbitals D orbitals are “double peanut” shaped There are 5 D orbitals 5 D x 2 e- = 10 e- can fit in D sublevel

7. F sublevel orbitals F orbitals are “fancy” shaped There are 7 D orbitals 7 D x 2 e- = 14 e- can fit in F sublevel

9. To Summarize: 7 energy levels 4 sublevels ( S, P, D, F) S orbitals = holds 2 e- P orbitals = holds 6 e- D orbitals = holds 10 e- F orbitals = holds 14 e-

10. Arrangement of e- in the atom 7 s 7 p 7 d 7 f 6 s 6 p 6 d 6 f 5 s 5 p 5 d 5 f 4 s 4 p 4 d 4 f 3 s 3 p 3 d 2 s 2 p 1 s

11. Arrangement of e- in the atom (aufbau) nucleus

12. Writing electron configurations ____ represents an orbital represents an e- with “up” spin represents an e- with “down” spin _____ two e- of opposite spin fill the orbital

13. What element is this? 1

14. What element is this? 2

15. What element is this? 1 2

16. Electron configuration for Ne ___ ___ ____ ____ ____ 1s 2s 2p 2 2 6

17. Write the e- configuration of As 33

18. Write the e- configuration of As 33 ___ ___ ___ ___ ___ ___ ___ ___ ___ 1s2 2s2 2p6 3s2 3p6 ___ ___ ___ ___ ___ ___ ___ ___ ___ 4s2 3d10 4p3 e- will not pair up in p, d or f orbitals if there is room in the orbital for them to spread out !

19. 1s22s2 2p63s2 3p64s2 2 – 8 - 8- 2

21. What element? 5 2 2

22. What element? 2 2 6 2 3