1. e - P + N O Oh My!

2. Particle Proton electron Neutron Symbol Where Charge Mass

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

5. A written nomenclature There is another way that some texts and articles write elemental nomenclature… CU 12 692 235 Mass Number / Atomic Mass Atomic Number

6. Protons Electrons Neutrons C Na Os Rn U

7. Isotopes and Ions Since the number of Protons can’t change, what about the number of electrons or neutrons? IsotopesYup – 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

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

9. 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. Ions Atoms with this “problem” – not neutral – are called Ions

10. Protons Electrons Neutrons F - Na + Cl - O -2 Al +3 Ba +2

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

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

13. Elements, Isotopes and Ions - Oh My!!! ProtonsElectronsNeutrons C Au U-238 F-F- Na + Al +3 U-235 +6

14. 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