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# Electron Configuration - PowerPoint PPT Presentation

Electron Configuration. How Many Electrons are In an Atom?. In an ATOM, . 3. Li. # Electrons = # Protons = Atomic Number. 6,7. 6.94. lithium. 3 Ways to Tell How Many Electrons. 3 Ways to Tell How Many Electrons. 3 Ways to Tell How Many Electrons. 3 Ways to Tell How Many Electrons.

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### Electron Configuration

• In an ATOM,

3

Li

# Electrons = # Protons = Atomic Number

6,7

6.94

lithium

Yesterday

Today

Tomorrow

Energy Level – distance away from the nucleus in which electron “resides”

-Think Bohr model-

Represented by 1, 2, 3, 4…

Orbital – regions in energy levels that have similar shapes

Represented by s, p, d, f

s = Sphere

p = dumbbell

d = clover

f= complicated Care to try??

Steps for determining Electron Configuration

Step

Example - Li

• Find the atomic number of the element – this is # electrons

Atomic # = 3

Li has 3 electrons

Steps for determining Electron Configuration

Step

Example - Li

• Put the electrons in their orbitals

3 electrons

Pauli Exclusion Principle – no more than two electrons per orbital

Aufbau Principle – electrons fill lowest energies first

Hund’s Rule - Electrons will stay unpaired in each energy level for as long as possible

Steps for determining Electron Configuration

Step

Example - Li

• Write electron configuration

3 electrons

Steps for determining Electron Configuration

Report:

Energy Level

# electrons

Orbital

Steps for determining Electron Configuration

Step

Example - Li

• Write electron configuration.

3 electrons

1s22s1

Sulfur

• Atomic # = 16

• Electron Configuration: 1s22s22p63s23p4

Arsenic

• Atomic # = 33

• Electron Configuration: 1s22s22p63s23p64s23d104p3

Carbon

• Atomic # = 6

• Electron Configuration: 1s22s22p2

Getting into an Excited State

• An electron in an excited state is in a higher state (orbital and/or energy level) than it usually is

• Ground state – normal level for an electron

• When the electron receives energy it jumps from the ground state to a higher level

• This electron will then fall back down to the ground state

• Remember the Lithium ground state?

1s22s1

• What if we make an electron excited?

• It’ll jump up in energy!

s p

Excited State Lithium-1s22p1

• Try Helium, Oxygen, Calcium, and Bromine with a Partner

• Then do the rest BY YOURSELF!!

• (Ask QUESTIONS when you need!!)