Isotopeone of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties. Every chemical element has one or more isotopes. An atom is first identified and labeled according to the number of protons in its nucleus. This atomic number is ordinarily given the symbol Z.
The discovery of the chemical elements known to exist today is presented here in chronological order. The elements are listed generally in the order in which each was first defined as the pure element, as the exact date of discovery of most elements cannot be accurately defined. There are plans to synthesise more elements. Given is each element's nameatomic numberyear of first report, name of the discoverer, and some notes related to the discovery. Years later, Ramsay, Cleve, and Langlet observed independently the element trapped in cleveite about the same time. From Wikipedia, the free encyclopedia.
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