1. The Periodic Table Alkali Metals

3. Alkali metals Most reactive metal group on periodic table Most reactive metal

4. Alkali – used to make fireworks

5. Cesium Until recently, international timekeeping devices were set to the vibrations of this element Cesium-133 atoms are sent from end to end in the vacuum tank of an atomic clock, as illustrated here. In the clocks at NRC, they travel up to 5 metres at about 250 m/s. NRC's largest cesium clock is shown below.

6. Lithium Compounds of Lithium are used as medication for a disease known as manic depression (Bi-polar disease) The lightest metal Methamphetamines- lithium used to make it – so battery sales are controlled Used in the Mt Palomar telescope’s mirror

7. Rubidium Can melt in your hand if you have a fever of 39 degrees celcius (102.2 F) Will react violently to the water on your hand!

8. Sodium

9. Sodium and potassium Both are responsible for the transmission of nerve impulsesnerve impulses

10. Francium Is unstable and decays into cesium