Chemical Element
A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus. They are divided into metals, metalloids, and non-metals. Familiar examples of elements include carbon, oxygen (non-metals), silicon, arsenic (metalloids), aluminium, iron, copper, gold, mercury, and lead (metals).
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Some articles on chemical element:
... The symbols of a chemical element are abbreviations that are used to denote a chemical element ... Also given is each element's atomic number, atomic mass or most stable isotope, group and period numbers on the periodic table, and etymology of the symbol ...
... chemical engineering where such a system would represent a specific physical setup, systems and processes in MFA can represent much larger and more abstract things as long as they are well ... This can be a certain chemical element such as cadmium or a substance such as CO2 ... We refer to chapter 2.1 from Brunner and Rechberger A chemical element is "a pure chemical substance consisting of one type of atom distinguished by its atomic number" ...
... The following sortable table includes the 118 known chemical elements, with the names linking to the Wikipedia articles on each ... by IUPAC provisional names for recently produced elements not yet formally named are in parentheses ... Group, period, and block refer to an element's position in the periodic table ...
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—Rose Macaulay (1881–1958)
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—Henry Brooks Adams (1838–1918)