Chemical species
Chemical species
Chemical species (/kɛmɪkəl ˈspiːʃiːz/) is a term used in chemistry to describe a chemical substance or ensemble composed of chemically identical molecular entities that can explore the same set of molecular energy levels on a characteristic or delineated timescale. These species can be atoms, molecules, ions, electrons, other particles or specified groups of such particles.
Etymology
The term "chemical species" was first used in the early 20th century. It is derived from the Latin word "species" which means "kind" or "sort", and the word "chemical" which is derived from the Greek word "khēmia" meaning "alchemy".
Related terms
- Chemical substance: A form of matter having constant chemical composition and characteristic properties. It cannot be separated into components by physical separation methods.
- Chemical reaction: A process that leads to the transformation of one set of chemical substances to another.
- Chemical compound: A chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds.
- Chemical element: A species of atoms having the same number of protons in their atomic nuclei.
- Molecule: The smallest particle in a chemical element or compound that has the chemical properties of that element or compound.
- Ion: An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
- Electron: A subatomic particle with a negative elementary electric charge.
External links
- Medical encyclopedia article on Chemical species
- Wikipedia's article - Chemical species
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