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Lanthanum at Chemical Elements.com
Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

Basic Information

Name: Lanthanum
Symbol: La
Atomic Number: 57
Atomic Mass: 138.9055 amu
Melting Point: 920.0 °C (1193.15 K, 1688.0 °F)
Boiling Point: 3469.0 °C (3742.15 K, 6276.2 °F)
Number of Protons/Electrons: 57
Number of Neutrons: 82
Classification: Rare Earth
Crystal Structure: Hexagonal
Density @ 293 K: 6.7 g/cm3
Color: white

Atomic Structure

[Bohr Model of Lanthanum]  
Number of Energy Levels: 6

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 18
    Fifth Energy Level: 9
    Sixth Energy Level: 2


Isotope Half Life
La-1346.5 minutes
La-1376000.0 years
La-1381.05E10 years
La-1401.67 days
La-1413.9 hours
La-1421.54 minutes


Date of Discovery: 1839
Discoverer: Carl Mosander
Name Origin: From the Greek word lanthaneis (to lie hidden)
Uses: expensive camera lenses
Obtained From: monazite, bastnasite

Related Links

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MLA Format for Citing This Page

Bentor, Yinon. Chemical Element.com - Lanthanum. <http://www.chemicalelements.com/elements/la.html>.

For more information about citing online sources, please visit the MLA's Website.

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