1. Atomic Structure and the Periodic Table

2. Chemical Symbols
Abbreviated way to write the name of an element

3. Matter and Atoms Matter is anything that has mass and takes up space.
- All matter is made up of atoms!!!!
- Atoms are made up of subatomic particles
1. Protons
2. Neutrons
3. Electrons

4. Nucleus The nucleus contains both Neutrons and Protons
Protons are positively charged particles
Neutrons are particles with a neutral/no charge
The nucleus contains
the majority of the
atoms mass.

5. Electrons Negatively Charged particles found outside the nucleus
Mass is about 1/2000 the mass of a proton

6. Atomic Number Is the number of protons an atom possesses
- Change the # of protons
you change the element
Atomic #
Atomic Symbol

7. Protons and Electrons Atomic # = # Protons In a neutral atom:
the # of electrons = Atomic # or # Protons
Why?
Electromagnetic Force
Electrons have a negative charge and protons have a positive charge
In order to be balanced the number of electrons and protons must be equal.

8. Atomic Models Visual representation of what an atom looks like Orbital
Nucleus
Bohr or Planetary Model

9. Atomic Models Continued
Electron Cloud
More realistic than the planetary model
Describes a region where an electron is likely to be at any time
Electron
Cloud
Nucleus

10. Energy Levels and Electrons
Electrons vary in their distance to the nucleus
Further away = higher energy
Closer = Less energy
7 Electron Energy levels
Energy Level Added Per Level Total Electrons
Level
Level
Level
Level
Level
Level
Level