Atoms

Atoms

1. Element

   • Substance made of one type of atom
   • Over 100 different types
   • Elements in a group share similar properties

2. Chemical Symbols

   • usually consists of 1 or 2 letters
   • 3 letters for newly discovered elements

3. Structure of an atom

   • Electrons surround nucleus
   • Nucleus contains protons and neutrons
   • Neutrons = neutral
   • Protons +1, Electrons -1