1. Warm-Up We have a name for atoms with a charge, what is it?
One of the three subatomic particles changes in number, which one is it?

2. Review Atomic Number: Gives us the number of Protons
Which value is the atomic number?
Atomic Mass: Sum of the #p+ and #n
#n = Atomic Mass – Atomic Number
#e- = #p+ - charge
What happens when we have a negative charge

3. Charged Atoms Charged atoms are called IONS
Change in the number of electrons
Now we are going to learn about another special case of atoms…

4. Isotopes
Isotope Video

5. What Are Isotopes?
Atoms with the same number of protons, but different numbers of neutrons.
Atoms of the same element (same atomic number) with different atomic masses.
Isotopes of Chlorine
35Cl 37Cl
chlorine chlorine - 37

6. Learning Check
Naturally occurring carbon consists of three isotopes, C-12, C-13, and C-14. State the number of protons, neutrons, and electrons in each of these carbon atoms.
12C C 14C
#p _______ _______ _______
#n _______ _______ _______
#e _______ _______ _______

7. Lab Pick a partner One of you will come get a lab procedure
DO NOT WRITE ON THE LAB PROCEDURE
You will EACH need to write down the answers of the lab and turn in a report.