Potassium argon dating
It always occurs in compounds, combined with other elements.It was first prepared in pure form in 1807 by English chemist Sir Humphry Davy (1778-1829).Argon is perticularly important for the metal industry, being used as an inert gas shield in arc welding and cutting.Other uses incude non-reactive blanket in the manufacture of titanium and other reactive elements and as a protective atmosphere for growing silicon and germanium crystals.The periodic table is a chart that shows how chemical elements are related to one another.The alkali metals also include lithium, sodium, rubidium, cesium, and francium. Potassium is so active that it never occurs free in nature.
Argon has approximately the same solubility as oxygen and it is 2.5 times as soluble in water as nitrogen .Atomic number 18; atomic weight 39.948; melting point -189.3°C; boiling point -185.9°C.(är'gŏn') Symbol Ar A colorless, odorless element in the noble gas group. This is an informational tour in which students gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.
Argon is an inert, colorless and odorless element — one of the Noble gases.World production exceeds 750.000 tonnes per year, the supply is virtually inexhaustible.