![[ATOM]](atom.gif) |
Erbium
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Information valid for Er-167 unless otherwise noted
Basic Information
Symbol: Er
Atomic Number: 68
Mass: 167.26
Melting Point: 1522.0 C
Boiling Point: 2510.0 C
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
![[Bohr Model of Erbium]](b0068.gif) |
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Number of Energy Levels: 6
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 30
Fifth Energy Level: 8
Sixth Energy Level: 2
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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