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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.
Oxygen is a chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and a potent oxidizing agent that readily forms oxides with most elements as well as with other compounds.
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 ...
C 8 H 7 ClO 2: benzyl chloroformate: 501-53-1 C 8 H 7 F 2 NO: difluoroacetanilide: 404-17-1 C 8 H 7 F 7 O 3: ethyl heptafluorobutanoylacetate: 336-62-9 C 8 H 7 I: iodocubane: 74725-77-2 C 8 H 7 IO 2: methyl 4-iodobenzoate: 619-44-3 C 8 H 7 N: benzeneacetonitrile: 140-29-4 C 8 H 7 N: indole: 120-72-9 C 8 H 7 N: indolizine: 274-40-8 C 8 H 7 NO ...
C 7 H 8 F 2 Si: phenyl methyl difluorosilane: 328-57-4 C 7 H 8 N 2: isopropenylpyrazine: 38713-41-6 C 7 H 8 N 2 O: acetonylprazine: 6784-62-9 C 7 H 8 N 2 O: methyl iminopicolinate: 19547-38-7 C 7 H 8 N 4 O 2: theophylline: 5967-84-0 C 7 H 8 O: benzyl alcohol: 100-51-6 C 7 H 8 O: cresol: 1319-77-3 C 7 H 8 O: nortricyclone: 695-05-6 C 7 H 8 O 2 ...
Thus, all carbon isotopes have nearly identical chemical properties because they all have six electrons, even though they may have 6 to 8 neutrons. That is why atomic number, rather than mass number or atomic weight, is considered the identifying characteristic of an element. The symbol for atomic number is Z.
Nitrogen is a chemical element; it has symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table , often called the pnictogens . It is a common element in the universe , estimated at seventh in total abundance in the Milky Way and the Solar System .
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.