atomic structure

atomic structure

1. atom

   • the smallest part of an element that can exist
     • have a radius of around 0.1 nanometers and have no charge (0)

2. element

   • contains only one type of atom
     • around 100 different elements each one is represented by a symbol

3. compound

   • two or more elements chemically combined
     • compounds can only be separated into elements by chemical reactions

4. central nucleus

   • contains protons and neutrons

5. electron shells

   • contains electron