French Revolution Timeline May 5, 1789 A meeting of the Estates-General is called by Louis XVI in Versailles to discuss and approve a new tax plan. June 17, 1789 Three Poitevin cures decide to join the Third Estate, leaving the Chambers of the Clergy.
Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table. Its boiling and melting points are the lowest among all the elements.
Gas Physical Properties. Acetylene ; Air ; Ammonia; Argon; Arsine; Boron Trichloride; Boron Trifluoride; Butane; Carbon Dioxide; Carbon Monoxide; Chlorine; Deuterium; Diborane; Dichlorosilane; Disilane; Ethane; Ethyl Chloride; Ethylene; Fluorine; Halocarbon-116; Halocarbon-23; Helium; Hydrogen; Hydrogen Chloride; Hydrogen Fluoride; Hydrogen Sulfide; Krypton; Methane; Neon; Nitrogen; Nitrogen Trifluoride