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.
The fact that helium is inert and does not form compounds or react to any existing element is its chemical propertyâ¦.âits inability to undergo a change that alters its compositionâ.[âPhysical and Chemical Properties of Matterâ University of California Davis ].