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Spectral studies of Cr I and Cr II atoms: Observed and predicted spectrum of Cr I and Cr II atoms - Couverture souple

Riyaz, A.; Rahimullah, K.; TAUHEED, A.

 
9783659248061: Spectral studies of Cr I and Cr II atoms: Observed and predicted spectrum of Cr I and Cr II atoms
Couverture souple
ISBN 10 : 3659248061 ISBN 13 : 9783659248061
Editeur : LAP LAMBERT Academic Publishing, 2012

Synopsis

Chromium was discovered in 1780 by Nicolas Louis Vanquelin.Chromium was named from the Greek word ‘chroma’, meaning color because it forms a variety of colorful compounds. Chromium metal is an essential trace element, but hexavalent chromium (Cr(VI)) is very toxic and carcinogenic.Chromium is a silver, lustrous, very hard metal that can take a high mirror polish. It is also odorless, tasteless, and malleable. It does not tarnish in air, when heated it burns and forms the green chromic oxide. Chromium is unstable in oxygen.Its main uses are in alloys such as stainless steel, in chrome plating and in metal ceramics. People can be exposed to chromium through breathing, eating or drinking and through skin contact with chromium or chromium compounds. The level of chromium in air and water is generally low. In drinking water the level of chromium is usually low as well, but contaminated well water may contain the dangerous chromium(IV); hexavalent chromium. Atomic number-24 Atomic mass-51.996 g.mol-1 Electronegativity-1.6 Density-7.19 g.cm-3 at 20°C Melting point-1907°C Boiling point-2672°C Vanderwaals radius-0.127 nm Ionic radius-0.061 nm (+3) ; 0.044 nm (+6) Isotopes-6

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À propos de l'auteur

Riyaz Ahemad,MPhil in Physics from Dept. of Phys., AMU, Aligarh, India in 2008. He is purs. his PhD in Physics (Atomic Spectroscopy), 9 yrs. teaching exp. at UG & PG level.His five papers have been published in reputed international jour. & book chapter. He has presented 9 papers.His research interest is in Atomic Spectroscopy and LASER Physics.

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Éditeur
LAP LAMBERT Academic Publishing
Date d'édition
2012
Langue
anglais
ISBN 10 
3659248061
ISBN 13 
9783659248061
Reliure
Broché
Nombre de pages
128
Coordonnées du fabricant
non disponible
Personne responsable
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