Lanthanum

=Lanthanum=


 * Atomic Number:** 57


 * Protons:**  57


 * Electrons:** 57  


 * Neutrons:**  82


 * Average Atomic Mass:**  138.90547


 * Isotopes:**139-la

This gives the date, where known, of the discovery of the element, together with the discover and place of discovery.
 * Discovery:**

from the Greek word Lanthanein meaning to lie hidden 
 * Name:**
 * Uses:**A few uses of the element or its compounds are listed.


 * Interesting Facts**: one of the most important things that you need to about lanthanum is that it is silvery white, malleable, ductile, and soft enough to be cut with a knife. It is one of the most reactive of the rare-earth metals.


 * Video:** http://www.youtube.com/watch?v=Q21clW0s0B8&eurl=http://www.periodicvideos.com/videos/057.htm&feature=player_embeddedmedia type="youtube" key="Q21clW0s0B8" width="425" height="350"

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 * Sources**
 * Photo:[|Search]
 * Video: [|http://www.youtube.com/watch?v=Q21clW0s0B8&eurl=http://www.periodicvideos.com/videos/057.htm&]