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Electron Configurations Unit 3

Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

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Sublevels! They are labeled s, p, d, and f!  Each sublevel has a different shape to it!

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Page 1: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

Electron Configurations

Unit 3

Page 2: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

What are electron configurations?

According to the wave mechanical model, the electrons in an atom move around in the orbitals surrounding the nucleus.

There are 7 orbitals! They are numbered 1 – 7!

Each orbital has sublevels!

Page 3: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

Sublevels!

They are labeled s, p, d, and f!Each sublevel has a different shape to it!

Page 4: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

s - sublevel

Page 5: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

p Sublevel

Page 6: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

d - sublevels

Page 7: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

f - sublevels

Page 8: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

Each sublevel has a certain # of “rooms” that 2 electrons reside in.

s has 1 “room”p has 3 “rooms”d has 5 “rooms”f has 7 “rooms”

How many electrons fit in each sublevel total?

Page 9: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

Electron Configurations

Are a way of writing out where all the electrons are in an atom.

It specifies the orbital, sublevel, and how many electrons are in the sublevel.

Page 10: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

Order of filling

Page 11: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

Rules for writing electron configurations

Pauli exclusion principleEach “room” can hold a maximum of 2

electrons, but they must be spinning in opposite directions.

Aufbau PrincipleElectrons enter orbital in order of increasing

energy.Hund’s Rule

One electron must fill each “room” in a sublevel before there can be 2.

Page 12: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

Examples

Nitrogen1s22s22p3

Iron1s22s22p63s23p64s23d6

Page 13: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

Exceptions to the rules.

Chromium 1s22s22p63s23p64s13d5

Molybdenum

1s22s22p63s23p64s23d104p65s14d5

Tungsten

1s22s22p63s23p64s23d104p65s24d105p66s15d5

Copper 1s22s22p63s23p64s13d10

Silver 1s22s22p63s23p64s23d104p65

s14d10

Gold 1s22s22p63s23p64s23d104p65

s24d105p66s15d10

Page 14: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

The Periodic Table and Noble Gas Configurations

Noble gas configurations are a short hand way of writing electron configurations & the Periodic Table can be used to help you write them!

Page 15: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the
Page 16: Electron Configurations Unit 3. What are electron configurations? According to the wave mechanical model, the electrons in an atom move around in the

Let’s try some!

Nitrogen Electron configuration - 1s22s22p3

Noble Gas configuration – [He] 2s22p3

IronElectron configuration - 1s22s22p63s23p64s23d6

Noble Gas configuration – [Ar] 4s23d6


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