The Periodic Table

The Periodic Table

1. Modern Periodic Table

   • Ordered with increasing atomic structure
   • Groups have similar properties
   • Electrons in the same group have the same number number of electrons in the outer shell

2. Group 1

   • Stored in oil
     • Reacts violently with water and air
   • Endothermic reation with water
   • Very reactive
     • The further down in the table the more reative
       • Boling and melting points lower also
   • Soft (easy to cut)
   • Low density
   • Alkali metals
   • Burns with coloured flames

3. Mendeleev

   • He put elements in order of atomic mass vertically
   • The elements families were vertical
   • Left gaps for elements he predicted were going to be found