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A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
The first letter is always capitalized. While the symbol is often a contraction of the element's name, it may sometimes not match the element's English name; for example, "Pb" for lead (from Latin plumbum) or "W" for tungsten (from German Wolfram). Elements which have only temporary systematic names are given temporary three-letter symbols (e.g ...
The English word indigo is from Spanish indico and Dutch indigo (from Portuguese endego), from Latin indigo, from Greek ἰνδικόν (indikon): "blue dye from India". Tin (Sn) 50 tin: Anglo-Saxon via Middle English: The word tin is borrowed from a Proto-Indo-European language, and has cognates in several Germanic and Celtic languages. [38]
32 of these have names tied to the Earth and the other 10 have names connected to bodies in the Solar System. The first tables below list the terrestrial locations (excluding the entire Earth itself, taken as a whole) and the last table lists astronomical objects which the chemical elements are named after. [1]
This named isotope later became the official name for element 86 in 1923. T: Tritium: 1: From the Greek tritos. Name given to 3 H. Th: Thorium: 90: After Thor. Name restricted at one time to 232 Th, an isotope of thorium. This named isotope later became the official name for element 90. ThA: Thorium A: 84
A chemical element is a substance that cannot be divided or changed into different substances by ordinary chemical methods. The smallest particle of such an element is an atom , which consists of electrons centered around a nucleus of protons and neutrons .
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Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on. Each of these names can be further abbreviated by a one- or two-letter chemical symbol; those for hydrogen, helium, and lithium are respectively H, He, and Li. [6] Neutrons do not affect the atom's chemical identity, but do affect its weight.