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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 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 ...
Carbon (from Latin carbo 'coal') is a chemical element; it has symbol C and atomic number 6. It is nonmetallic and tetravalent—meaning that its atoms are able to form up to four covalent bonds due to its valence shell exhibiting 4 electrons. It belongs to group 14 of the periodic table. [13] Carbon makes up about 0.025 percent of Earth's ...
At standard pressure, carbon, the lightest carbon group element, sublimes at 3825 °C. Silicon's boiling point is 3265 °C, germanium's is 2833 °C, tin's is 2602 °C, and lead's is 1749 °C. Flerovium is predicted to boil at −60 °C. [11] [12] The melting points of the carbon group elements have roughly the same trend as their boiling points ...
C 8 ClF 15 O: perfluorooctanoyl chloride: 335-64-8 C 8 Cl 4 N 2: tetrachloroisophthalonitrile: 1897-45-6 C 8 Co 2 O 8: dicobalt octacarbonyl: 10210-68-1 C 8 F 4 N 2: tetrafluorophthalonitrile: 1835-65-0 C 8 F 14 O 3: heptafluorobutyric anhydride: 336-59-4 C 8 F 16: perfluoroethylcyclohexane: 335-21-7 C 8 F 17 I: perfluorooctyl iodide: 507-63-1 ...
Periodic table of the chemical elements showing the most or more commonly named sets of elements (in periodic tables), and a traditional dividing line between metals and nonmetals. The f-block actually fits between groups 2 and 3 ; it is usually shown at the foot of the table to save horizontal space.
Publishers Weekly said that the book was a "lively introduction to the chart that has been the bane of many a chemistry student", [5] and in a review in New Scientist, Vivienne Greig called The Periodic Table "an engrossing read and an ideal way to painlessly impart a great deal of science history to seen-it-all-before teenagers."
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The causes the endothermic reaction [8] [9] 14 N + p → 11 C + 4 He − 2.92 MeV. It can also be produced by fragmentation of 12 C by shooting high-energy 12 C at a target. [10] Carbon-11 is commonly used as a radioisotope for the radioactive labeling of molecules in positron emission tomography. Among the many molecules used in this context ...
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