Atomic structure

Atomic structure

1. Electron shells

   • rules:
     • 1st shell = 2 electrons
     • 3rd shell = 8 electrons
     • 2nd shell = 8 electrons
   • electrons always move in shells

2. Atoms

   • particles:
     • Electron (-)
       • move in shells around neucleus
     • proton (+)
       • number of protons equals number of electrons
     • Neutron (0)
   • no charge overall. they're Neutral

3. Atomic Number

   • Number of protons

4. Mass Number

   • total number of protons and neutrons

5. Relative Atomic Mass

   • Is an Average