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Electron Configuration

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

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  1. Electron Configuration

  2. How Many Electrons are In an Atom? • In an ATOM, 3 Li # Electrons = # Protons = Atomic Number 6,7 6.94 lithium

  3. 3 Ways to Tell How Many Electrons

  4. 3 Ways to Tell How Many Electrons

  5. 3 Ways to Tell How Many Electrons

  6. 3 Ways to Tell How Many Electrons Yesterday Today Tomorrow

  7. Background Information Energy Level – distance away from the nucleus in which electron “resides” -Think Bohr model- Represented by 1, 2, 3, 4…

  8. Background Information Orbital – regions in energy levels that have similar shapes Represented by s, p, d, f

  9. Background Information s = Sphere

  10. Background Information p = dumbbell

  11. Background Information d = clover

  12. Background Information f= complicated Care to try??

  13. Steps for determining Electron Configuration Step Example - Li • Find the atomic number of the element – this is # electrons Atomic # = 3 Li has 3 electrons

  14. Steps for determining Electron Configuration Step Example - Li • Put the electrons in their orbitals 3 electrons

  15. Step 2 Pauli Exclusion Principle – no more than two electrons per orbital

  16. Step 2 Aufbau Principle – electrons fill lowest energies first

  17. Step 2 Hund’s Rule - Electrons will stay unpaired in each energy level for as long as possible

  18. Steps for determining Electron Configuration Step Example - Li • Write electron configuration 3 electrons

  19. Steps for determining Electron Configuration Report: Energy Level # electrons Orbital

  20. Steps for determining Electron Configuration Step Example - Li • Write electron configuration. 3 electrons 1s22s1

  21. Example 2 - Sulfur • Atomic # = 16 • Electron Configuration: 1s22s22p63s23p4

  22. Example 3 - Arsenic • Atomic # = 33 • Electron Configuration: 1s22s22p63s23p64s23d104p3

  23. Example 4 - Carbon • Atomic # = 6 • Electron Configuration: 1s22s22p2

  24. 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

  25. 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

  26. 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

  27. 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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