Learning on ScreenWhat 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
Credits
- Director
- David R Clark
- Producer
- David R Clark
- Writer
- A N Coulson
- Contributor
- David R Clark
- Cast
A N Coulson
Production Company
- Name
University of London Audio-Visual Centre
- Notes
- Closed down.
Sponsor
Distributor
- Name
Learning on Screen - the British Universities and Colleges Film and Video Council
- services@bufvc.ac.uk
- Web
- http://bufvc.ac.uk External site opens in new window
- Phone
- 020 3743 2345
- Address
- York House
221 Pentonville Road
London
N1 9UZ - Notes
- The Learning on Screen distribution library is currently only available in part. Please contact us with any individual queries. The two series of InterUniversity History Film Consortium films which make extensive use of archive footage been digitised for free, online viewing by UK HE institutions - see Learning on Screen InterUniversity History Film Consortium Films (qv).
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