Atoms, Elements and the Periodic Table

Atoms, Elements and the Periodic Table

1. History

   • Newlands
     • atomic weights
   • Mendeleev
   • They are grouped by the fact they have similar properties and, the same number of electrons in their outer shell.

2. Atomic (proton) number

3. Group

4. Period

5. Atom

   • Isotope
     • Inequal
   • Nucleus
     • Protons and Neutrons.

6. Relative atomic mass