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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. Although humanity had always been surrounded by these substances, it has not always known ...
C 9 HF 17 O 2: perfluorononanoic acid: 375-95-1 C 9 H 2 Cl 6 O 3: chlorendic anhydride: 115-27-5 C 9 H 4 Cl 3 NO 2 S: folpet: 133-07-3 C 9 H 4 Cl 8 O: isobenzan: 297-78-9 C 9 H 4 O 5: trimellitic anhydride: 552-30-7 C 9 H 5 BrCrO 3: bromobenzenechromium tricarbonyl: 12082-02-9 C 9 H 5 CrFO 3: fluorobenzenechromium tricarbonyl: 12082-05-2 C 9 H ...
AFM image of 1,5,9-trioxo-13-azatriangulene and its chemical structure. [3] A molecule is a group of two or more atoms that are held together by attractive forces known as chemical bonds; depending on context, the term may or may not include ions that satisfy this criterion.
Atoms can also combine to create materials that do not consist of discrete molecules, including crystals and liquid or solid metals. [ 136 ] [ 137 ] This atomic matter forms networked arrangements that lack the particular type of small-scale interrupted order associated with molecular matter.
The He 2 molecule has a large separation distance between the atoms of about 5,200 picometres (52 Å). This is the largest for a diatomic molecule without rovibronic excitation. The binding energy is only about 1.3 mK, 10 −7 eV [6] [7] [8] or 1.1×10 −5 kcal/mol. [9] Both helium atoms in the dimer can be ionized by a single photon with
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).
A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using chemical symbols for the chemical elements, and subscripts to indicate the number of atoms involved. For example, water is composed of two hydrogen atoms bonded to one oxygen atom: the chemical formula is H 2 O.
Because atoms and molecules are said to be matter, it is natural to phrase the definition as: "ordinary matter is anything that is made of the same things that atoms and molecules are made of". (However, notice that one also can make from these building blocks matter that is not atoms or molecules.) Then, because electrons are leptons, and ...