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Basic Information

Name: Erbium
Symbol: Er
Atomic Number: 68
Atomic Mass: 167.26 amu
Melting Point: 1522.0 °C (1795.15 K, 2771.6 °F)
Boiling Point: 2510.0 °C (2783.15 K, 4550.0 °F)
Number of Protons/Electrons: 68
Number of Neutrons: 99
Classification: Rare Earth
Crystal Structure: Hexagonal
Density @ 293 K: 8.795 g/cm³
Color: grayish

Atomic Structure

Number of Energy Levels: 6

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

Isotopes

Isotope	Half Life
Er-162	Stable
Er-164	Stable
Er-166	Stable
Er-167	Stable
Er-168	Stable
Er-169	9.4 days
Er-170	Stable
Er-171	7.5 hours
Er-172	2.1 days

Facts

Date of Discovery: 1843
Discoverer: Carl Mosander
Name Origin: Ytterby (a town in Sweden)
Uses: ceramics
Obtained From: heavier rare earth minerals

MLA Format for Citing This Page

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

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