By a Chemical Bond, Bonded at the Valence electrons
Molecule
No, Molecules are just 2 or more atoms of the same element joined together.
They create molecules. If the atoms joined together are from different elements they create polar molecules.
Atoms can fuse together to form molecules or compounds.
molecules / compounds
molecules and compounds
Compounds
molecules.
No, I think that the only thing that is joined together by atoms is an element.
A molecule is when two atoms are bonded together. A compound is when two DIFFERENT atoms are bonded together. All compounds are molecules. Not all molecules are compounds.
A compound
Atoms are just a single atom, obviously. Molecules are at least two atoms joined chemically, as opposed to a compound, which is at least two different elements joined together. For example, a single atom of Oxygen would be O. An oxygen molecule would be O2, O3, etc. A compound would be Oxygen and another element, such as Hydrogen, combined to make H2O (water, two Hydrogen, one Oxygen) or H3O (hydrogen peroxide, 3 oxygen, one hydrogen). This means that water is both a molecule (two or more atoms joined together) AND a compound (two or more atoms of different elements combined together). All compounds are molecules, but not all molecules are compounds.