![]() ![]() We call molecules that contain an odd number of electrons free radicals. They also possess unique electronic and optical properties that have been put to good use in solar powered devices and chemical sensors. Because of their size and shape, fullerenes can encapsulate other molecules, so they have shown potential in various applications from hydrogen storage to targeted drug delivery systems. This type of molecule, called a fullerene, consists of a complex network of single- and double-bonded carbon atoms arranged in such a way that each carbon atom obtains a full octet of electrons. An entire class of compounds, including spheres and tubes of various shapes, were discovered based on C 60. In 1996, the Nobel Prize in Chemistry was awarded to Richard Smalley, Robert Curl, and Harold Kroto for their work in discovering a new form of carbon, the C 60 buckminsterfullerene molecule. NH 3: all atoms have the correct number of electronsĬarbon soot has been known to man since prehistoric times, but it was not until fairly recently that the molecular structure of the main component of soot was discovered.HCCH: form a triple bond between the two carbon atoms.H 3CCH 3: all atoms have the correct number of electrons. ![]() Where needed, rearrange electrons to form multiple bonds in order to obtain an octet on each atom: Where needed, place remaining electrons on the central atom: NH 3: no terminal atoms capable of accepting electrons.HCCH: no terminal atoms capable of accepting electrons.Where needed, distribute electrons to the terminal atoms: H 3CCH 3: (1 × 3) + (2 × 4) + (1 × 3) = 14ĭraw a skeleton and connect the atoms with single bonds.What are the Lewis structures of these molecules?Ĭalculate the number of valence electrons. Titan also contains ethane (H 3CCH 3), acetylene (HCCH), and ammonia (NH 3). NASA’s Cassini-Huygens mission detected a large cloud of toxic hydrogen cyanide (HCN) on Titan, one of Saturn’s moons. ![]()
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