1. Isotope Review Notes

2. Quick Review
An isotope is an atom that has the same number of protons but a different number of neutrons compared to other atoms of the same element.
** If I change the number of protons, I change the element I have, so the number of protons will never change for a particular element
** The number of electrons can change, it’s called an ion, we will study those after break

3. We can write isotopes two ways
Mass Number
Mass Number
C-14
Atomic Number

4. Start memorizing if you haven’t already…
Protons = Atomic Number Neutrons = Mass Number – Atomic Number Electrons (since there is no charge) = the number of Protons

5. Draw the following pictures with the correct scientist's model
Dalton’s Billiard Ball Model
Thomson’s Plum Pudding Model
Rutherford’s Planetary Model
Bohr’s Ground State Model
Electron Cloud Model

6. Why were all these guys so important…
They helped us come to the conclusion that…
Protons are positive
Neutrons are neutral
Electrons are negative
Protons and neutrons are in the nucleus which is large and dense
Electrons are found in the electron cloud that takes up most of the space of an atom which is pretty empty

7. Making Connections
Like charges repel one another… and opposite charges are attracted to each other…

8. However… the nucleus has such a strong force that holds it together the positive protons inside are densely packed together

9. Goal for today… Thursday Test A Finish practicing isotopes
Start the review sheet (finish for homework)
Put your notebook in order
Tomorrow…
Review Game
Opportunity for last minute questions
Thursday Test A