What is a distinguishing characteristic of each and every person?

Fingerprints - every person has their own fingerprint

DNA - every person has their own DNA signatureEach 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 4 - 7 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 1s

2s 2s

3s 3s

4s 4s

5s 5s 6s 6s

7s 7s

3d 3d 3d 3d 3d 3d 3d 3d 3d 3d

4d 4d 4d 4d 4d 4d 4d 4d 4d 4d

4f

4f 4f 4f 4f 4f 4f 4f 4f 4f 4f 4f 4f 4f

5d 5d 5d 5d 5d 5d 5d 5d 5d

5d

5f

5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f

6d 6d 6d 6d 6d 6d 6d 6d 6d

6d

2p 2p 2p 2p 2p 2p

3p 3p 3p 3p 3p 3p

4p 4p 4p 4p 4p 4p

5p 5p 5p 5p 5p 5p

6p 6p 6p 6p 6p 6p

7p 7p 7p 7p 7p 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 FillDiagram

2s 2p

ElectronConfiguration 2s2 2p3

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

3d10

4d10

5d10

6d10

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 ConfigurationUses the noble gases to skip parts of the electron configuration

He1s2

Ne2p6

Ar3p6

Kr4p6

Xe5p6

Rn6p6

[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-)

ElectronConfig. 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