Potassium

Potassium or k

• atomic number is 19

• atomic weight is 39.948

• color is Silver

• state at 298.15°k is Solid

• classification is Metallic

• date of discovery is 1807

• density kg/m^3 is 862

• melting point is 336.5

• boiling point is ? 950 K

• group is Alkali Metal

• Number of neutron is 21