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Protactinium, radioactive chemical element; symbol Pa; at. no. 91; at. wt. 231.0359; m.p. greater than 1,600°C; b.p. 4,026°C; sp. gr. 15.37 (calculated); valence +4, +5. Protactinium is a malleable, shiny silver-gray radioactive metal. It does not tarnish...more
Protactinium is a metallic element that belongs to the actinoid group, with a bright metallic luster that it retains for some time in contact with air. ...
en.wikipedia.org/wiki/Protactinium - Similar
This WebElements periodic table page contains Essential information for the element protactinium.
www.webelements.com/protactinium/ - Similar
Dec 15, 2003 ... The name protoactinium was shortened to protactinium in 1949. In 1927, Grosse prepared 2 mg of a white powder, which was shown to be Pa2O5. ...
periodic.lanl.gov/elements/91.html - Similar
The Element Protactinium - Basic Physical and Historical Information.
education.jlab.org/itselemental/ele091.html - Similar
Feb 22, 2007 ... Comprehensive information for the element Protactinium – Pa is provided by this page including scores of properties, element names in many ...
environmentalchemistry.com/yogi/periodic/Pa.html - Similar
chemical properties, health and environmental effects of protactinium.
www.lenntech.com/periodic/elements/pa.htm - Similar
Infomation on Protactinium general properties, States, energies, appearance and Characteristics.
www.chemicool.com/elements/protactinium.html - Similar
Basic information, atomic structure, and isotopes.
www.chemicalelements.com/elements/pa.html - Similar
The first isotope of Protactinium to be discovered was 234Pam (also called Uranium X2), an ephemerous member of the natural decay series of 238U. This ...
www.vanderkrogt.net/elements/elem/pa.html - Similar
Radioactive Properties of the Key Protactinium Isotope ... Protactinium is a malleable, shiny, silver-gray radioactive metal that ...
www.ead.anl.gov/pub/doc/protactinium.pdf - Similar
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