Lanthanum

Ashley Ross and Brett Yerg//__**  **//__Area 1: Essential Data__ Element: Lanthanum Symbol: La Atomic Number: 57 Atomic Mass: 138.9055 Period: 6 Group: 3 Standard State at Room Teperature: Solid//** [|**//http://www.chemicalelements.com/elements/la.html//**] Lanthanum was discovered in 1839 by Carl Gustav Mosander. //**
 * __//Lanthanum
 * //__Area 2: History__

Boiling Point:// //3469.0 °C (6276.2 °F) Melting Point: 920.0 °C (1688.0 °F) Atomic Number: 57 Atomic Mass: 138.9055 Isotopes: Pecent Abundance: State of Matter: Color: White Texture://
 * //__Area 3: Physical Proerties__

//__ Area 4: Element Uses __ Biogical Role: // ** //Lanthanum has no known biological role. The element is not absorbed orally, and when injected its elimination is very slow. //[|//Lanthanum carbonate//]// was approved as a medication (Fosrenol, //[|//Shire Pharmaceuticals//]//) to absorb excess //[|//phosphate//]// in cases of end-stage renal failure. Some rare-earth chlorides, such as lanthanum chloride (LaCl3), are known to have //[|//anticoagulant//]// properties. // //While Lanthanum has pharmacological effects on several receptors and ion channels, its specificity for the GABA receptor is unique among divalent cations. Lanthanum acts at the same modulatory site on the GABAR as zinc- a known negative allosteric modulator. The Lanthanum cation La3+ is a positive allosteric modulator at native and recombinant GABA receptors, increasing open channel time and decreasing desensitization in a subunit configuration dependent manner. //

 

  **// Bohr Model of Lanthanum //**

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 * //Lanthanum