Potassium
Videos
Potassium is a chemical element; it has symbol K and atomic number 19. It is a silvery white metal that is soft enough to easily cut with a knife. Potassium metal reacts rapidly with atmospheric oxyge
Potassium pearls (in paraffin oil, ~5 mm each)
Sir Humphry Davy
Pieces of potassium metal
Potassium in feldspar
Periodic table
Videos
The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows and columns. An icon of chemistry, the periodic table is widely used
Potassium
…flaky white potassium peroxide in only seconds of exposure. It was first isolated from potash, the ashes of plants, from which its name derives. In the periodic table, potassium is one of the alkali metals, all of which have a single valence electron in the outer electron shell, which is easily removed to create an…
Liquid mercury. Its liquid state at standard conditions is the result of relativistic effects.
Graphite and diamond, two allotropes of carbon
Iron, a metal
Sulfur, a nonmetal