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A non-Kekulé molecule is a conjugated hydrocarbon that cannot be assigned a classical Kekulé structure [definition needed]. Since non-Kekulé molecules have two or more formal charges or radical centers, their spin-spin interactions can cause electrical conductivity or ferromagnetism ( molecule-based magnets ), and applications to functional ...
For example, the molecule acetylene has molecular formula C 2 H 2, but the simplest integer ratio of elements is CH. The molecular mass can be calculated from the chemical formula and is expressed in conventional atomic mass units equal to 1/12 of the mass of a neutral carbon-12 ( 12 C isotope ) atom.
Protonated molecular hydrogen – H + 3; Trioxidane – H 2 O 3; Water - H 2 O [204] He. Sodium helide – Na 2 He; I. In. Indium(I) bromide – InBr;
A chemical compound is a chemical substance composed of many identical molecules ... which include truly non-stoichiometric examples, from chemical compounds, which ...
An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds — that is, a compound that is not an organic compound. [1] [2] The study of inorganic compounds is a subfield of chemistry known as inorganic chemistry.
They are caused by the temporary repulsion of electrons away from the electrons of a neighboring molecule, leading to a partially positive dipole on one molecule and a partially negative dipole on another molecule. [6] Hexane is a good example of a molecule with no polarity or highly electronegative atoms, yet is a liquid at room temperature ...
The ammonia molecule (NH 3), like the water molecule, is abundant in the universe, being a compound of hydrogen (the simplest and most common element) with another very common element, nitrogen. [51] The possible role of liquid ammonia as an alternative solvent for life is an idea that goes back at least to 1954, when J. B. S. Haldane raised ...
This is an index of lists of molecules (i.e. by year, number of atoms, etc.). Millions of molecules have existed in the universe since before the formation of Earth. Three of them, carbon dioxide, water and oxygen were necessary for the growth of life.