1. Atom, Bohr-Rutherford, and the Periodic Table
Atomic Structure
Atom, Bohr-Rutherford, and the Periodic Table

2. A New Order
Atomic Number – how many protons and electrons there are in an atom
Mass Number – total number of protons and neutrons.
Atomic Mass Units – atomic mass does appear on the periodic table and is measured in u.
Not measured on a balance, it is how they are relative to each other
A proton is about 1u, a neutron is about 1u and an electron is 1/1837 in relation to protons and neutrons

3. Looking Forward Atomic number
Helps to define arrangement of periodic table
Relates to chemical properties of elements
Relates to arrangement of electrons
Group 1 – how many electrons are in outer (valence) shell?