1. Isotope
-an atom with a different number of NEUTRONS than protons

2. Isotope
-an atom with a different number of NEUTRONS than protons
Carbon
- 12
protons
neutrons 6 6
total number of particles
In nucleus
Mass # ___ 12

3. Now you do Carbon-14. We’ll check in 1 minute.
- 12
protons
neutrons 6 6
total number of particles in nucleus
Mass # ___ 12
Carbon
- 13
protons
neutrons 6 7
Mass # ___ 13
Now you do Carbon-14. We’ll check in 1 minute.

4. Carbon
- 14
protons
neutrons 6 8
Mass # ___ 14

5. Ion -an atom with a different number of ELECTRONS than protons before
Sodium
Na +1
11 p+
11 N
before
after
11+
11+ Na +1
11-
10-
1 outer electron= unstable!
Chlorine
17+
17+ -1 Cl
17-
18-
17 p+
17 N
Cl -1