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Electrons…

Electrons… . Mrs. Vindi’s Students are Awesome!. Quick Review - Protons . Yesterday we talked about finding Proton Remember Protons are Positive Turn to your partner and tell them how to find Protons…. P+. Protons = Atomic Number. Quick Review - Neutrons .

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Electrons…

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  1. Electrons… Mrs. Vindi’s Students are Awesome!

  2. Quick Review - Protons • Yesterday we talked about finding Proton • Remember Protons are Positive • Turn to your partner and tell them how to find Protons… P+

  3. Protons = Atomic Number

  4. Quick Review - Neutrons • Yesterday we talked about finding Neutrons • Remember NEUTRons are NEUTRal • Turn to your partner and tell them how to find Protons… N

  5. Neutrons - Atomic Mass-Protons

  6. Are you ready for some Electrons? • Don’t say No-I know you can do it! • Electrons are Tricky. • First of all – remember what the charge is on an electron? • NEGATIVE!!!

  7. Balancing Charges We’ve learned that Protons are Positive and Electrons are Negative. The result is that Protons and Electrons exist in a “Tug-O-War” for control of the charge of the atom. Imagine you had two protons (2 + Charges) Imagine there was 1 electron (1 -) The result is the atom would have a charge of +1

  8. Let’s Practice… • Atom #1 has • 4 Protons • 3 Electrons • What’s it’s charge???

  9. Let’s Practice… • Atom #2 has • 4 Protons • 5 Electrons • What’s it’s charge???

  10. Let’s Practice… • Atom #3 has • 4 Protons • 4 Electrons • What’s it’s charge???

  11. Elements Name: # protons: # Neutrons: # electrons: Mass: Charge: _ + + + OOOO _ -

  12. Elements Name: # protons: # Neutrons: # electrons: Mass: Charge: + = 8 O = 8 -

  13. Elements Name: # protons: # Neutrons: # electrons: Mass: Charge: + = 18 O = 22 -

  14. Okay-Now comes the HARD part… • Imagine you have to calculate electrons for an Oxygen atom with a charge of -2?

  15. Oxygen (-2) • ?: Step #1 – Calculate your Protons • A: Oxygen has 8 protons! • ?: Step #2 – Ask if your charge is Positive or Negative? • A: Negative • ?Step#3 – If the charge is negative-add the number of your charge to protons to get electrons • A 8+2 = 10 electrons!

  16. Okay-Now comes the HARD part… • Imagine you have to calculate electrons for an Oxygen atom with a charge of +2?

  17. Oxygen (+2) • ?: Step #1 – Calculate your Protons • A: Oxygen has 8 protons! • ?: Step #2 – Ask if your charge is Positive or Negative? • A: Positive • ?Step#3 – If the charge is positive-subtract the number of your charge to protons to get electrons • A 8 -2 = 6 electrons!

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