What is a distinguishing characteristic of each and every person? Fingerprints - every person has their own fingerprint DNA - every person has their own DNA signature Each element has it's own unique electron configuration They tell us where in an atom the LAST electron is located, and where each element "lives" on the periodic table. ELECTRON CONFIGURATION

Suppose you want to send a letter to a friend somewhere in the United States After the street name? This is similar to an electron in an atom. The electron configuration is the electron's address in the atom. Aside from the Zip Code -- what will the post office look at first? After the state, what is the next thing the post office will need? After the city?

The Basics - where is the electron located? 1. The Energy Level ( it is similar to the state when you mail a letter) 2.The Sublevel (it is similar to the city) # 1 - 7: 7 rows on the periodic table s, p, d, f : these are the letters used to represent sublevels Some "states" are larger than others so they can have more "cities." Likewise, the larger the energy level the more sublevels they can contain. Energy level 1 can only have an s sublevel Energy level 2 can only have an s & p sublevel Energy level 3 can only have an s, p & d sublevel Energy level can have s, p, d & f sublevels

4. The Spin (number) 3. The Orbital (is similar to the street) Some "cities" have more "streets" than others s has one p has three d has five f has seven All orbitals can hold 2 electrons and they must be of opposite spin OR

1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p H He N Co

1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p Homework

1s 2s 3s 4s 5s 6s 7s 3d 4d 4f 5d 5f 6d 2p 3p 4p 5p 6p 7p

1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p Electron Configuration Shorthand form of Orbital Fill Diagrams The only difference: Orbital Fill uses orbitals and half arrows 1s Electron Configuration uses exponents 1s2 1s Example: Nitrogen 1s2 Orbital Fill Diagram 2s 2p Electron Configuration 2s22p3

1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p Electron Configuration C Co Kr

1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p Homework

1s1 2s1 3s1 4s1 5s1 6s1 7s1 1s2 2s2 3s2 4s2 5s2 6s2 7s2 3d1 4d1 5d1 6d1 3d2 4d2 5d2 6d2 3d3 4d3 5d3 6d3 3d4 4d4 5d4 6d4 3d5 4d5 5d5 6d5 3d6 4d6 5d6 6d6 3d7 4d7 5d7 6d7 3d8 4d8 5d8 6d8 3d9 4d9 5d9 6d9 3d1 0 4d1 0 5d1 0 6d1 0 4f1 5f1 4f2 5f2 4f3 5f3 4f4 5f4 4f5 5f5 4f6 5f6 4f7 5f7 4f8 5f8 4f9 5f9 4f10 5f10 4f11 5f11 4f12 5f12 4f13 5f13 4f14 5f14 2p1 3p1 4p1 5p1 6p1 7p1 2p2 3p2 4p2 5p2 6p2 7p2 2p3 3p3 4p3 5p3 6p3 7p3 2p4 3p4 4p4 5p4 6p4 7p4 2p5 3p5 4p5 5p5 6p5 7p5 2p6 3p6 4p6 5p6 6p6 7p6

1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p Abbreviated Electron Configuration Uses the noble gases to skip parts of the electron configuration He 1s2 Ne 2p6 Ar 3p6 Kr 4p6 Xe 5p6 Rn 6p6 [He] 2e- 1s2 [Ne] 10e- 2p6 [Ar] 18e-3p6 [Kr] 36e- 4p6 [Xe] 54e- 5p6 [Rn] 86e- 6p6 symbol # e-ending e- conf. Find the Noble Gas that comes before the element on the periodic table. Example: Tin -- Sn (50 e-) Electron Config. 1s22s22p63s23p64s23d104p65s24d105p2 Abb. e- Config. 5s24d105p2 [Kr] 36e- Noble gas = Krypton (36e-) Start e- config. after 4p6

1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p Abbreviated Electron Configuration [He] [Ne] [Ar] [Kr] [Xe] [Rn] 2e- symbol # e-ending e- conf. 10e- 18e- 36e- 54e- 86e- 1s2 2p6 3p6 4p6 5p6 6p6 As Dy U Rb Sc

1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p Homework