Electrons…

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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…

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+

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

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!!!
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

Let’s Practice…
• Atom #1 has
• 4 Protons
• 3 Electrons
• What’s it’s charge???
Let’s Practice…
• Atom #2 has
• 4 Protons
• 5 Electrons
• What’s it’s charge???
Let’s Practice…
• Atom #3 has
• 4 Protons
• 4 Electrons
• What’s it’s charge???

Elements Name:

# protons:

# Neutrons:

# electrons:

Mass:

Charge:

_

+ + +

OOOO

_

-

Elements Name:

# protons:

# Neutrons:

# electrons:

Mass:

Charge:

+ = 8

O = 8

-

Elements Name:

# protons:

# Neutrons:

# electrons:

Mass:

Charge:

+ = 18

O = 22

-

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