1. Atoms and the Periodic Table http://learn.genetics.utah. edu/content/cells/scale/ http://learn.genetics.utah. edu/content/cells/scale/

2. Atomic Theory …So there were these scientists who thought the world was made of things we couldn’t see The structure of the atom is still being studied-that’s why it’s a theory Some scientists you may hear about: Democritus, Dalton, Rutherford, Thomson, Bohr, Millikan, Chadwick, Meitner, Schrodinger, Heisenberg, Seaborg, Curie….

3. ATOMS ARE: The smallest part of a pure substance you can have that is still that substance A “pure substance” is made of one type of material (atom) The building blocks of each of the 118 elements on the periodic table. Each element is made up of their own group of identical atoms. For example: the element gold (Au) is ONLY made of gold atoms Able to combine to form larger and more complex substances (we’ll get to them in a bit) Made of even smaller particles: protons, neutrons, electrons (these are made up of even smaller particles) Still mysterious!! We don’t know how all the parts work completely

4. ELEMENTS ARE: Made of atoms Only breakable into the smaller atoms that make them up Organized by characteristic properties on THE PERIODIC TABLE OF ELEMENTS Each element has it’s own box Each element has numbers and symbols unique to themselves Natural and man-made There are 92 naturally occurring elements There are 26 man-made or synthetic elements-how do we do this?

5. THE PERIODIC TABLE, YOUR NEW BEST FRIEND!! How do we read it? ATOMIC NUMBER: Elements are organized by it Will tell you about the particles that make up an atom ATOMIC MASS: Seems to go in order, but be careful Will tell you about the particles that make up an atom SYMBOL Shorthand way to write element Very specific in terms of capitalization Use exactly as portrayed on Periodic Table!!! NAME What the element is called Some symbols match the names 2 He Helium 4.0026

6. To be continued…. Up next, organization of periodic table!