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2. Periodic Videos - Wikipedia

   en.wikipedia.org/wiki/Periodic_Videos

   It consists of a series of videos about chemical elements and the periodic table, with additional videos on other topics in chemistry and related fields. They are published on YouTube and produced by Brady Haran , a former BBC video journalist, mainly featuring Sir Martyn Poliakoff , Peter Licence, Stephen Liddle , Debbie Kays, Neil Barnes, Sam ...

3. List of chemical elements - Wikipedia

   en.wikipedia.org/wiki/List_of_chemical_elements

   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 visualization 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 ...

4. Alchemical symbol - Wikipedia

   en.wikipedia.org/wiki/Alchemical_symbol

   Alchemical symbols were used to denote chemical elements and compounds, as well as alchemical apparatus and processes, until the 18th century. Although notation was partly standardized, style and symbol varied between alchemists.

5. Chemical compound - Wikipedia

   en.wikipedia.org/wiki/Chemical_compound

   [16] [17] [18] A molecule may be homonuclear, that is, it consists of atoms of one chemical element, as with two atoms in the oxygen molecule (O 2); or it may be heteronuclear, a chemical compound composed of more than one element, as with water (two hydrogen atoms and one oxygen atom; H 2 O). A molecule is the smallest unit of a substance that ...

6. Category:Chemical compounds by element - Wikipedia

   en.wikipedia.org/wiki/Category:Chemical...

   The following are subcategories containing chemical compounds by element. An alternative listing of inorganic compounds may be found at inorganic compounds by element . Wikimedia Commons has media related to Chemical compounds by element .

7. Portal:Chemistry - Wikipedia

   en.wikipedia.org/wiki/Portal:Chemistry

   Chemistry is the scientific study of the properties and behavior of matter.It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.

8. Wikipedia:WikiProject Chemicals - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:WikiProject...

   This WikiProject aims to provide high-quality, standardized articles in Wikipedia for all important chemicals, similar to the Merck Index.This comprises all organic and inorganic compounds, elements, reagents, commodities, pharmaceuticals, pollutants, and other large-scale and small-scale chemicals of interest.

9. Atomicity (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Atomicity_(chemistry)

   Atomicity is the total number of atoms present in a molecule of an element. For example, each molecule of oxygen (O 2) is composed of two oxygen atoms. Therefore, the atomicity of oxygen is 2. [1] In older contexts, atomicity is sometimes equivalent to valency. Some authors also use the term to refer to the maximum number of valencies observed ...