What Happens to an Atom in a Molecule

Synopsis: When an atom becomes part of a molecule there are changes in the size and the shape of the charge-cloud associated with any one of the nuclei. If the atom forms a covalent bond to a neighbour, the size of the atom is decreased, due to attraction to two centres. If the bond is ionic, then the atom that gains a charge increases in size, and the one that loses an electron is smaller. Sometimes these changes can reverse the sequence of atomic sizes. Secondly the cloud is distorted; and has concentrations in the directions of whatever bonds are being formed. Next results are given for individual electrons, and their contribution to the total charge-cloud density. Recent experimental studies of photoelectron spectra provide support for theories. Finally since the nuclei are vibrating, care is needed to decide what precisely is the proper position to use for their centres.
Language: English
Country: Great Britain
Medium: Video; Videocassette. Standard formsts. b&w. 65 min.
Year of production: 1972
Availability: Sale
Uses: Chemistry students.
Subjects: Chemistry
Keywords: atoms; molecules

Director

David R Clark

Producer

Writer

Contributor

Cast

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