Information valid for La-139 unless otherwise noted
[ATOM]

Lanthanum

 [ATOM]

Basic Information


Symbol: La
Atomic Number: 57
Mass: 138.906
Melting Point: 920
Boiling Point: 3469
Number of Protons/Electrons: 57
Number of Neutrons: 82
Classification: Rare Earth
Crystal Structure: Hexagonal
Density: 6.7
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

Isotopes

Isotope Half Life
La-1346.5 minutes
La-1376000 years
La-1381.05e+010 years
La-139Stable
La-1401.67 days
La-1413.9 hours
La-1421.54 minutes

Facts


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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