Atomic Number

 19

 Atomic Mass

 39.0983 amu
                                                                                                                                                                  

Vital Information

Number of:
     Protons = 19
     Electrons = 19
     Neutrons = 20

Boiling Point = 774.0 °C(1047.15 K, 1425.2 °F)
Melting Point = 63.65 °C (336.8 K, 146.57 °F)
Density = 0.862 g/cm3
Electronegativity =  0.82 (Pauling Scale)


Photograph


 
 
History and uses: Potassium was discovered in 1807 by Sir Humphrey Davy.

-Used in glass and soap.

-potassium nitrate, KNO3, and potassium chlorate, KClO3, are used in fireworks

-the alloy of potassium with sodium (NaK) is used as a heat-transfer medium in nuclear reactors. The alloy is liquid at ambient temperature and is a good reducing agent in the chemistry laboratory

-low-sodium salt


 

 Pictures of examples of uses

References: http://www.webelements.com/webelements/scholar/elements/potassium/uses.html

http://www.chemicalelements.com/elements/k.html