Electron configuration
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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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How many electrons are in an atom
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 electrons3
3 Ways to Tell How Many Electrons

Yesterday

Today

Tomorrow


Background information
Background Information

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

-Think Bohr model-

Represented by 1, 2, 3, 4…


Background information1
Background Information

Orbital – regions in energy levels that have similar shapes

Represented by s, p, d, f





Background information5
Background Information

f= complicated Care to try??


Steps for determining electron configuration
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 configuration1
Steps for determining Electron Configuration

Step

Example - Li

  • Put the electrons in their orbitals

3 electrons


Step 2
Step 2

Pauli Exclusion Principle – no more than two electrons per orbital


Step 21
Step 2

Aufbau Principle – electrons fill lowest energies first


Step 22
Step 2

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


Steps for determining electron configuration2
Steps for determining Electron Configuration

Step

Example - Li

  • Write electron configuration

3 electrons


Steps for determining electron configuration3
Steps for determining Electron Configuration

Report:

Energy Level

# electrons

Orbital


Steps for determining electron configuration4
Steps for determining Electron Configuration

Step

Example - Li

  • Write electron configuration.

3 electrons

1s22s1


Example 2
Example 2 -

Sulfur

  • Atomic # = 16

  • Electron Configuration: 1s22s22p63s23p4


Example 3
Example 3 -

Arsenic

  • Atomic # = 33

  • Electron Configuration: 1s22s22p63s23p64s23d104p3


Example 4
Example 4 -

Carbon

  • Atomic # = 6

  • Electron Configuration: 1s22s22p2


Getting into an excited state
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


Excited state
Excited State

  • 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


Excited state what s it look like
Excited State- What’s it look like?

  • 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


On your own
On Your Own

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

  • Then do the rest BY YOURSELF!!

  • (Ask QUESTIONS when you need!!)


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