|
|
| About site: Chemistry/Elements/Praseodymium - Lenntech: Praseodymium |
Return to Science also Science
|
| About site: http://www.lenntech.com/Periodic-chart-elements/Pr-en.htm |
Title: Chemistry/Elements/Praseodymium - Lenntech: Praseodymium Physical data, chemical properties, health and environmental effects.
|
| Alexa statistic for http://www.lenntech.com/Periodic-chart-elements/Pr-en.htm |
Please visit: http://www.lenntech.com/Periodic-chart-elements/Pr-en.htm
|
| Related sites for http://www.lenntech.com/Periodic-chart-elements/Pr-en.htm |
| Northwestern_University_Intelligent_Information_Laboratory Conducts research into information access technologies. | | LLEK_Bookmarks_Scientific_Search__Engines_-_Economics Provides catalog of directories, economics-related search engines and additional starting points. | | David_Schubert,_Ph_D__-_Boron_Chemist Research interests of David Schubert,Ph.D., boron chemist at U.S. Borax Inc. in Valenica, California. | | KVB-Enertec Produce software and hardware for continuous emissions monitoring systems . Includes product specifications, employment opportunities, and industry links . | | Oscilloscope_Tutorials Basic overview of all the controls used in a typical osciloscope and how to set it up. Provides circuit diagrams, output graphs and formulas. | | Maryland_Centrifugal_eXperiment_(MCX) An experiment at the University of Maryland, College Park, US to test the idea of Centrifugal Confinement of Plasmas for Controlled Thermonuclear Fusion. | | X-Ray_of_Riemann\'s_Zeta_Function Graphic visualisation of zeta by Juan Arias de Reyna MartÃnez, University of Seville. | | Waiting_for_Bigfoot Jill Millers' performance art piece, consisting of camping in a Northern California forest and broadcasting the experience on the web while she "waits for bigfoot". Includes bigfoot and camp informat | | Stenhouse_Consultancy_UK A training and consultancy company based in Cardiff. Tailor-made programmes for businesses and an internationally recognised and certified range of specific NLP open training programmes, from "Foundat | | Biontex_Laboratories Offers high efficient transfection reagents for mammalien and insect cells. | | Ancient_Chronology This list is dedicated to discussing the Neo-Courville Interpretation, i.e., the view that the Middle Bronze 1 (or EB-MB) pottery horizon represents the biblical Exodus and Conquest. | | ChemicalElements_com__Polonium Basic information, atomic structure, and table of isotopes. | | The_Hedghogz_Home_Page Information on the European hedgehog, found in the UK and Western Europe. | | FMO_Project A public program offered by the University of Arizona's Spacewatch Project. Volunteers review images to help find NEOs that the computers miss. | | Cental_Indiana_Friends_of_C__G__Jung The Central Indiana Friends of Jung explores the concepts inspired by the works of Carl Gustav Jung through regular meetings that are open to the public. | | Northscope Chinese manufacturer of microscopes and accessories. | | Mid-Atlantic_Horticulture_Short_Course Annual event sponsored by the Virginia Horticultural Foundation, with programs for professionals as well as home gardeners. Overview of workshops and speakers. | | Essential_Economics_Pty_Ltd Essential Economics Pty Ltd provides research and policy advice for urban and regional economic development. | | Radiochemistry_of_Tungsten Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] (September, 1961) | | Logic_and_Algorithms Research session at the Isaac Newton Institute for Mathematical Sciences, Cambridge, UK; 16 January -- 7 July 2006. |
|
This is websites2007.org cache of m/ as retrieved on 2008.11.18 websites2007.org's cache is the snapshot that we took of the page as we crawled the web. The page may have changed since that time.
|
Praseodymium (Pr) - Chemical properties, Health and Environmental effects
_uacct = "UA-54093-1";
urchinTracker();
Praseodymium - Pr
Search :
Contact us
Chemical properties of praseodymium
- Health effects of praseodymium -
Environmental effects of
praseodymium
Atomic number
59
Atomic mass
140.91 g.mol -1
Electronegativity according to Pauling
1.1
Density
6.8 g.cm-3 at 20°C
Melting point
931 °C
Boiling point
3512 °C
Vanderwaals radius
unknown
Ionic radius
0.101 nm (+3)
Isotopes
5
Electronic shell
[ Xe ] 4f3 6s2
Energy of first ionisation
522 kJ.mol -1
Energy of second ionisation
1016 kJ.mol -1
Energy of third ionisation
2082.4 kJ.mol -1
Energy of fourth ionisation
3752 kJ.mol -1
Energy of fifth ionisation
5534 kJ.mol -1
Standard Potential
- 2.47 V
Discovered by
von Welsbach in 1885
Praseodymium
Praseodymium is a soft malleable, silvery-yellow metal. It is a member of the
lanthanide group of the periodic table of elements. It reacts slowly with
oxygen: when exposed to air it forms a green oxide that does not protect it from
further oxidation. It is more resistant to corrosion in air the other rare
metals, but it still needs to be stored under oil or coated with plastic. It
reacts rapidly with water.
Applications
A major use of the metal is in a pyrophoric alloy used in cigarettes lighter
flints. Praseodymium compounds have different uses: the oxide is used in carbon
electrodes for arc lighting, and it is know for its ability to give glass a nice
yellow colour. This glass filters out the infrared radiation, so it is used in
the goggles which protect the eyes of welders. The salts are used to colour
enamel and glass. Praseodymium can be used as alloying agent with magnesium to
create high strenght metals that are used in aircraft engines.
Praseodymium is one of the rare chemicals, that can be found in houses in equipment such as colour televisions, fluorescent lamps, energy-saving lamps and glasses. All
rare chemicals have comparable properties. The use of praseodymium is
still growing, due to the fact that it is suited to produce catalysers and to
polish glass.
Praseodymium in the environment
Praseodymium is one of the more abundant of rare-earth elements. It is four
time more abundant than tin. Praseodymium is usually
found only in two different kinds of ores.
The major commercial ores in which praseodymium is found are monazite and
bastnasite. The main mining areas are China, USA, Brazil, India, Sri Lanka and
Australia. Reserves of praseodymium are estimated to be around 2 million tonnes.
World production of praseodymium is about 2500 tonnes per year.
Health effects of praseodymium
Like all rare metals praseodymium is of low to moderate
toxicity. Soluble praseodymium salts are mildly toxic by ingestion, but
insoluble salts are non toxic. They are skin and eye irritants.Praseodymium is mostly dangerous in the working environment, due to the fact that damps and gasses can be inhaled with air. This can cause lung embolisms, especially during long-term exposure. Praseodymium can be a threat to the liver when it accumulates in the human body.
Environmental effects of praseodymium
Praseodymium is dumped in the environment in many different places, mainly by petrol-producing industries. It can also enter the environment when household equipment is thrown away. Praseodymium will gradually accumulate in soils and water soils and this will eventually lead to increasing concentrations in humans, animals and soil particles.
With water animals praseodymium causes damage to cell membranes, which has several negative influences on reproduction and on the functions of the nervous system.
Back to chart periodic elements
[ Home
] [ Back ] [ More
Information or question on Praseodymium? ]
Copyright © 1998-2008
Lenntech Water treatment & air purification Holding
B.V.
Rotterdamseweg 402 M
2629 HH Delft, The Netherlands
tel: (+31)(0)15 26.10.900
fax: (+31)(0)15 26.16.289
e-mail: info@lenntech.com
|
|
| |
Physical | data, | chemical | properties, | health | and | environmental | effects. |
|
http://www.lenntech.com/Periodic-chart-elements/Pr-en.htm
Lenntech: Praseodymium 2008 November
dvd rental
dvd
Physical data, chemical properties, health and environmental effects.
Rules
|
© 2008 Internet Explorer 5+ or Netscape 6+
|
|
Recommended Sites: 1.
Arts -
Business -
Computers -
Games -
Health -
Home -
Kids and Teens -
News -
Recreation -
Reference -
Regional -
Science -
Shopping -
Society -
Sports -
World
Miss Gallery
- Top Anime Hentai
- DVD rental by mail
- Masini second hand - Best Credit Cards - Property in Spain - Internet Advertising - Online Image Resizer
|
