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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 ...
This is a list of unsolved problems in chemistry. Problems in chemistry are considered unsolved when an expert in the field considers it unsolved or when several experts in the field disagree about a solution to a problem.
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This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
The Vaillant Group is a company that develops products for heating, cooling and hot water. [1] The company employs ~17,000 people worldwide and generates an annual turnover of approximately 3.7 billion euros. This makes the Vaillant Group one of the largest companies in its sector in Europe.
In chemistry, a free element is a chemical element that is not combined with or chemically bonded to other elements. Examples of elements which can occur as free elements include the oxygen molecule (O 2) and carbon. [1] Other examples of free elements include the noble metals gold and platinum. [2]
List of chemical elements. Element Origin of name [1] [2] Group Period Block Standard atomic weight A r °(E) [a] Density [b] [c] Melting point [d] Boiling point [e ...
With Berzelium, erroneously identified as a mixture of three elements, with thorium, during work at the University of North Carolina. [5] Coronium: 26: Iron: 1869 Charles Augustus Young and William Harkness: Hypothesised from a 530.3 nm green emission line in the solar coronal spectrum. Later, around 1902, renamed as Newtonium.