The simplest organic compound is CH4, methane. Ionic or covalent compound that is made of atoms of two different elements. Examples: MgCl2; Al2O3; HCl; H2O; CH4. A molecule that is built of exactly two atoms either of the same element or of two different elements.Click to see full answer. Keeping this in view, is ch4 a molecule or compound?All compounds are molecules but not all molecules are compounds. Molecular hydrogen (H2), molecular oxygen (O2) and molecular nitrogen (N2) are not compounds because each is composed of a single element. Water (H2O), carbon dioxide (CO2) and methane (CH4) are compounds because each is made from more than one element. is HCl a molecule or formula unit? The hydrogen chloride molecule HCl is a simple diatomic molecule consisting of a hydrogen atom H and a chlorine atom Cl connected with a covalent single bond. Since the chlorine atom is much more electronegative than the hydrogen atom, the covalent bond between the atoms is quite polar. Thereof, is a formula unit the same as a molecule? 1 Answer. A molecule is composed of two or more elements that are covalently bonded. A formula unit indicates the lowest whole number ratio of ions in an ionic compound.Is oxygen a compound?Oxygen in the atmosphere is a molecule because it contains molecular bonds. It is not a compound because it is made from atoms of only one element – oxygen. This type of molecule is called a diatomic molecule, a molecule made from two atoms of the same type.