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- molecular formula
- The chemical formulaA represention of the elemental composition of a substance; subscripts are used to indicate the relative numbers of atoms of each kind of element present. of a substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula. written using the subscripts that reflect the number of each kind of atom present in a moleculeA set of atoms joined by covalent bonds and having no net charge. of the substance. For example, the simplest formula for ethane is CH3, but the molecular formulaThe chemical formula of a substance written using the subscripts that reflect the number of each kind of atom present in a molecule of the substance. For example, the simplest formula for ethane is CH3, but the molecular formula is C2H6 because there are 2 C atoms and 6 H atoms in a molecule of ethane. is C2H6 because there are 2 C atomsThe smallest particle of an element that can be involved in chemical combination with another element; an atom consists of protons and neutrons in a tiny, very dense nucleus, surrounded by electrons, which occupy most of its volume. and 6 H atoms in a molecule of ethane.