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In origin, the term is borrowed from the Greek χημία or χημεία.substances, metals, crystals and other aggregates of matter.
The chemistry laboratory stereotypically uses various forms of laboratory glassware.
Chemical substances are classified in terms of their structure, phase, as well as their chemical compositions.
They can be analyzed using the tools of chemical analysis, e.g. Scientists engaged in chemical research are known as chemists.
The atom is also the smallest entity that can be envisaged to retain the chemical properties of the element, such as electronegativity, ionization potential, preferred oxidation state(s), coordination number, and preferred types of bonds to form (e.g., metallic, ionic, covalent).
A chemical element is a pure substance which is composed of a single type of atom, characterized by its particular number of protons in the nuclei of its atoms, known as the atomic number and represented by the symbol Z.