Its called a compound. When 2 elements come together they will sometimes be able to form a compound. a compound is 2 elements formed together to make 1 single substance.
Aluminum is the element found in a compound called bauxite.
carbon monoxide
Molecule
Diphosphonic Acid. I beleve.
Quicklime is a compound, specifically calcium oxide (CaO), which is produced by heating limestone in a process called calcination. It is not an alloy because it is composed of a single type of element, calcium.
sulphurdioxide
Radium is a chemical element; a compound has a minimum of two chemical elements.
An element and a compound can undergo a chemical reaction called a single replacement reaction. In this type of reaction, the element replaces one of the elements in the compound, forming a new compound and a different element as a product.
The elements a compound contains and the exact number of atoms of each element in one unit of that compound is referred to as the chemical formula of the compound.
That's because of the way "compound" is defined. If atoms of an element combine with other atoms of the SAME element, then it's not called a "compound".
It is simply called a molecule of an element. (ex: O2 is oxygen gas, H2 is hydrogen gas)
Steam is the vapour phase of the compound called water.