~~Covalcncc
Covalcncc - раздел Образование, Part One THE PREDICATE Many Compound Substanccs Do Not Have Particularly High Melting And Boiling Po...
Many compound substanccs do not have particularly high melting and boiling points, do not conduct electricity when they arc molten, and, thus, give no indication of being ionic. The particlcs of such compounds arc molecules. In these, any bond between two atoms is believed to be a pair of shared electrons, as it was suggested originally by the American chcmist G. N. Lewis. The electrons of such a shared pair occupy a single orbital and spin in opposite directions. Atoms entering such unions arc said to cxibit covalcncc and the bonds thus formed arc described as covalcnt.
""" When two or more atoms share electrons to form molcculcs, all the electrons of the several atoms involved[7] become common property and arc distributed among energy levels and orbitals characteristic of the molecules. A simpler treatment than this method of molecular orbitals is that of atomic orbitals. By it, cach atom in the molcculc is treated as if it controlled all its own electrons cxccpt those shared with another atom. The shared electrons arc treated as common to both.
The carbon-atom has two electrons in its first main energy level and four in its second. To obtain a noble-gas configuration it would have to loose or gain 4 electrons. Since it can do neither, it approaches the desired goal as nearly as possible by sharing its 4 electrons with atoms that also seek greater stability and will, in turn, share some of their valence electrons with it.
