1. e- P+ NO
Oh My!

2. Particle Proton electron Neutron
Symbol
Where
Charge
Mass

4. He Helium 4.00260 Atomic Number 2 Atomic Mass
Number of Protons Number of electrons
Number of Protons + Neutrons
Atomic Mass

5. Protons Electrons NeutronsNa Os Rn U

6. Isotopes and Ions
Since the number of Protons can’t change, what about the number of electrons or neutrons?
Yup – You can change the number of Neutrons- which changes the mass, and some properties – these different massed atoms of one element are called Isotopes.
Famous Isotopes – U-235, C-14, Pu-239, Po-210

7. C-14 C-12 U-238 U-235 H-1 (hydrogen) H-2 (deuterium) H-3 (tritium)
Protons Electrons Neutrons
C-14
C-12
U-238
U-235
H-1 (hydrogen)
H-2 (deuterium)
H-3 (tritium)

8. Danger – math weirdness
What about changing the number of electrons? Adding or Subtracting
Danger – math weirdness
If you add electrons – the number is negative, if you subtract electrons, the number is positive.
Atoms with this “problem” – not neutral – are called Ions

9. Protons Electrons NeutronsF-
Na+
Cl-
O-2
Al+3
Ba+2

10. Atomic Mass
Average mass of all the isotopes as they exist on Earth

11. Put in the information for the 3 subatomic particles
Particle name
Symbol
Charge
Location in atom
Mass

12. Elements, Isotopes and Ions - Oh My!!!
Protons
Electrons
Neutrons C Au
U-238 F-
Na+
Al+3
U-235+6

13. Disclaimer
Aloha I put together these power points for use in my science classes. You may use them in your classes. Some images are public domain, some are used under the fair-use provisions of the copyright law, some are mine. Copyright is retained by the owners!
Ted Brattstrom