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Erbium

What is Erbium

Erbium (pronunciation UR-bee-em [2]), represented by the chemical symbol Er [1], belongs to the family of rare earth metals [3]. A mixture of six isotopes with mass numbers 162, 164, 166, 167, 168 and 170 is found in naturally occurring erbium.[1, 3]. It reacts with air, water, halogens and acids [9].

Erbium

Where Is It Found

3.5 milligrams of it can be found in per kilogram of the earth’s crust. It has an oceanic abundance of 8.7 X 10-7 milligrams per liter [2]. It is mainly found in the minerals monazite and bastnaesite [1].

History

Origin of Its Name: It is named after Ytterby, a village in Sweden [1].

Who Discovered It: Swedish chemist Carl Gustav Mosander [1, 2].

Erbium Metal

How Was Erbium Discovered

In 1843, Mosander separated gadolinite, a mineral discovered in a quarry near Ytterby, into 3 substances that he named yttria, erbia and terbia. He synthesized terbium and erbium from terbia and erbia respectively. It was later found that terbia was terbium oxide (yellow) and erbia was erbium oxide (pink). However, the early samples of the metal contained other rare earths. A pure sample could only be produced in 1934 by heating purified erbium chloride and potassium by the scientists Wilhelm Klemm and Heinrich Bommer [1, 2].

Erbium Identification

Atomic Number  68 [1]
CAS Number  7440-52-0 [1]
Position in the periodic table Group Period Block
  Lanthanides [1] 6 [1] f [1]

Properties and Characteristics of Erbium

General Properties

Atomic mass 167.259 atomic mass units [1]
Atomic weight 167.259 [1]

Physical Properties

Color/appearance Silvery white [3]
Malleability Yes [11]
Ductility Yes [11]
Melting point/freezing point 1529°C, 2784°F [1]
Boiling point 2868°C, 5194°F  [1]
Density 9.07 g cm-3 [1]
State of matter at room temperature (normal phase) Solid [1]
Mohs Hardness 1.97 [7]
Electrical conductivity 1.2 X 106 S/m [7]

Chemical Properties

Oxidation states 3 [10]

Atomic Data of Erbium (Element 68)

Valence electrons 2 [8]
Quantum numbers
– n 4 [8]
– ℓ 3 [8]
– m 1 [8]
– m s [8]
Electron configuration (noble gas configuration) [Xe] 4f126s2 [1]
Crystal structure Hexagonal [10]
Atomic structure
– Number of Electrons 68 [3]
– Number of Neutrons 98 [3]
– Number of Protons 68 [3]
Energy levels [3]
– First Energy Level 2
– Second Energy Level 8
– Third Energy Level 18
– Fourth Energy Level 30
– Fifth Energy Level 8
– Sixth Energy Level 2
Radius of atom
– Atomic Radius 2.29 Å [1]
– Covalent Radius 1.77 Å [1]
Ionic charge +3 [2]
Electronegativity (Pauling scale) 1.24 [1]
Ionization energy

(kJmol-1) [1]

1st 2nd 3rd 4th 5th 6th 7th
589.304 1151.07 2194.08 4119.9

Erbium Electron Configuration (Bohr Model)

Erbium Uses

It has few uses since it slowly tarnishes in air and is decomposed by water [1].

  • Being good neutron absorbers, its isotopes are used in nuclear reactor control rods [3].
  • It is used in alloys along with Vanadium mostly to decrease the hardness of metals [3].
  • It is used in photographic filters as absorbers of infrared light [3].
  • It finds application in medical yttrium aluminum garnet (YAG) lasers for skin resurfacing procedures such as acne scar, mole, tattoo and wart removals [3], stretch marks and seborrheic keratosis treatment [6]. The laser is also used in the dental field [5].
  • Erbium is doped into the glass fiber of fiber optic cables carrying broadband signals, in order to amplify them [1, 2].
  • Erbium 169 with a half-life of 9.4 days is medically used to relieve pain in synovial joints that are related to arthritis [4].

Is It Dangerous

It has a low toxicity [1], though not much is known about its effects on health.

Erbium Image

Interesting Fact

  • It was one of the first lanthanoid elements to be discovered [1].

Erbium Cost

Pure erbium costs $540 per 100 grams whereas the same amount in bulk costs $65 [3].

References

  1. http://www.rsc.org/periodic-table/element/68/erbium
  2. https://education.jlab.org/itselemental/ele068.html
  3. https://www.chemicool.com/elements/erbium.html
  4. https://www.acls-pals-bls.com/nuclear-medicine-and-medical-isotopes/
  5. https://www.dentistryiq.com/articles/wdj/print/volume-1/issue-4/science/erbium-laser-technology.html
  6. http://www.jkslms.or.kr/journal/view.html?uid=6&vmd=Full
  7. http://periodictable.com/Elements/068/data.html
  8. http://chemistry-reference.com/q_elements.asp?Symbol=Er&language=en
  9. https://www.webelements.com/erbium/chemistry.html
  10. https://environmentalchemistry.com/yogi/periodic/Er.html
  11. http://www.chemistryexplained.com/Di-Fa/Erbium.html

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