Are oxygen, water, carbon dioxide, and hydrogen elements?

Chemical Makeup. A molecule of the compound carbon dioxide contains one atom of the element carbon and two atoms of the element oxygen. Each oxygen atom shares a double bond with the carbon atom. Carbon is the sixth element in the periodic table and occurs in pure form as coal and diamonds. read more

Research from the University of Texas at Arlington and the Wadia Institute of Himalayan Geology suggests that hydrogen, oxygen, water and carbon dioxide are being generated in the earth's mantle hundreds of kilometers below the earth's surface. read more

Like all compounds, the properties of water are very different from those of the elements from which it is composed. Water is a compound made up of two elements—hydrogen and oxygen. The characteristic properties of these elements are different from those of water. read more