1. 1 2 3 4 5 6 7 6 7 1A 2A 3B4B5B6B7B8B 1B2B 3A4A5A6A7A 8Agroup # = # valence (outside) e- d p f s Row = # shells

2. Electron Configuration 1s11s1 row # shell # possibilities are 1-7 7 rows subshell possibilities are s, p, d, or f 4 subshells group # # valence e- possibilities are: s: 1 or 2 p: 1-6 d: 1-10 f: 1-14 Total e- should equal Atomic # What element has an electron configuration of 1s 1 ?

3. Practice: Ask these questions every time you have to write an electron configuration Lithium: 1.find the element on the periodic table 2.what is the period number? 3.how many shells? 4.what is the group number? 5.how many valence electrons? 6.what subshell(s) does Li have? 7.what is the electron configuration? atomic # = 3 2 2 1 1 s 1s 2 2s 1

4. Practice: Ask these questions every time you have to write an electron configuration Boron: 1.find the element on the periodic table 2.what is the row #? 3.how many shells? 4.what is the group #? 5.how many valence electrons? 6.what subshell(s) does B have? 7.what is the electron configuration? atomic # = 5 2 2 3 3 p 1s 2 2s 2 2p 1

5. Order of Electron Subshell Filling: It does not go “in order” 1s 2 2s 2 2p 6 3p 6 4p 6 5p 6 6p 6 7p 6 3s 2 4s 2 5s 2 6s 2 7s 2 3d 10 4d 10 5d 10 6d 10 4f 14 5f 14 1s 2 2s 2 2p 6 3p 6 3s 2 4s 2 4p 6 5s 2 3d 10 5p 6 6s 2 4d 10 6p 6 7s 2 5d 10 4f 14 7p 6 6d 10 5f 14

6. 1 2 3 4 5 6 7 6 7 period # = # e- shells 1A 2A 3B4B5B6B7B8B 1B2B 3A4A5A6A7A 8Agroup # = # valence e- d f 3d 4d 5d 6d 4f 5f Subshells d and f are “special”

7. Electron Configuration 1s11s1 row # shell # possibilities are 1-7 7 rows subshell possibilities are s, p, d, or f 4 subshells group # # valence e- possibilities are: s: 1 or 2 p: 1-6 d: 1-10 f: 1-14 Total e- should equal Atomic # What element has an electron configuration of 1s 1 ?

8. Practice: Ask these questions every time you have to write an electron configuration Lithium: 1.find the element on the periodic table 2.what is the row #? 3.how many shells? 4.what is the group #? 5.how many valence electrons? 6.what subshell(s) does Li have? 7.what is the electron configuration?

9. Practice: Ask these questions every time you have to write an electron configuration Boron: 1.find the element on the periodic table 2.what is the row #? 3.how many shells? 4.what is the group #? 5.how many valence electrons? 6.what subshell(s) does B have? 7.what is the electron configuration?

10. Order of Electron Subshell Filling: It does not go “in order” 1s 2 2s 2 2p 6 3p 6 4p 6 5p 6 6p 6 7p 6 3s 2 4s 2 5s 2 6s 2 7s 2 3d 10 4d 10 5d 10 6d 10 4f 14 5f 14