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- chemical formula
- A represention of the elemental composition of a substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula.; subscripts are used to indicate the relative numbers of 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. of each kind of element present.