Lanthanum
By Briana Morales
Physical and Chemical Properties
Atomic Mass: 138.9055
Atomus Radius in pm: N/A
Density: 6.146 g/cm to the 3rd power
Melting Point: 920 degrees C
Boiling Point: 3464 degrees C
At 22 degrees C it's a solid
Appearence: rectangular shape that is silver
Conductivity: 13 W/(m K)
Malleability: Yes
Hardness: not that hard, able to cut with a knife
Very flammable and reactive
Background Info
Lanthanum has 57 protons, 82 neutrons, and 57 electrons. Carl Gustav Mosander found this element while extracting lanthama from impure cerium nitrate in Stockholm, Sweden in 1839. Lanthanum comes from the Greek word lanthanein. Carbon lighting in a studio is one of the most common uses for lanthanum and mostly found in the ores of monazite sand.
Works Cited
Websites: http://periodictable.com/Elements/057/index.html https://www.hobart.k12.in.us/ksms/PeriodicTable/lanthanum.htm http://www.rsc.org/periodic-table/element/57/lanthanum http://periodic.lanl.gov/57.shtml http://education.jlab.org/itselemental/ele057.html http://www.periodicvideos.com/videos/057.htm http://www.webelements.com/lanthanum/geology.html
Books: The Elements by Theodore Gray
Element Project: Lanthanum