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List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. 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 discoveries of the 118 chemical elements known to exist as of 2024 are 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 determined. There are plans to synthesize more elements, and it ...
The following is a list of chemicals published as a requirement of Safe Drinking Water and Toxic Enforcement Act of 1986, commonly known as California Proposition 65, that are "known to the state to cause cancer or reproductive toxicity" as of January 3, 2020.
The pictogram for harmful substances of the Globally Harmonized System of Classification and Labelling of Chemicals.. The Globally Harmonized System of Classification and Labelling of Chemicals (GHS) is an internationally agreed-upon standard managed by the United Nations that was set up to replace the assortment of hazardous material classification and labelling schemes previously used around ...
Today, 118 elements are known, the first 94 of which are known to occur naturally on Earth at present. Of the 94 natural elements, eighty have a stable isotope and one more has an almost-stable isotope (with a half-life of 2.01×10 19 years, over a billion times the age of the universe).
These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list ( discriminated by classifications ). This category combines all Wikipedia articles in need of updating from July 2024 (2024-07) to enable us to work through the backlog more systematically. It is a member of Category:Wikipedia ...
The CAS Registry is an authoritative collection of disclosed chemical substance information. It identifies more than 204 million unique organic and inorganic substances and 69 million protein and DNA sequences, [3] plus additional information about each substance. It is updated with around 15,000 additional new substances daily. [5]
For example, USD (United States dollar) has numeric code 840 which is also the ISO 3166-1 code for "US" (United States). List of ISO 4217 currency codes Active codes (list one) The following is a list of active codes of official ISO 4217 currency names as of 1 January 2024. In the standard the values are called "alphabetic code", "numeric code ...