Table of contents

1. Matter is made up of atoms:
   • early history of chemistry
2. Dalton´s atomic theory:
   • elements are made up of atoms
   • atoms vary in size
   • atoms vary in mass / relative atomic mass
3. Thomson´s plum pudding model:
   • cloud of positive charge
   • negatively charged electrons
4. Bohr´s quantum model:
   • orbits, valence electrons
5. Dimitri Mendeleev´s periodic table
6. The periodic table: elements are arranged according to:
   • increasing atomic number
   • periods
   • groups
7. Which information does the periodic table provide?
   • metals / nonmetals
   • what atoms look like
   • what chemical properties an element has
8. Keywords: English-German