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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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Presentation Transcript
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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