Chemical Elements.com - Dysprosium (Dy)

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Basic Information

Name: Dysprosium
Symbol: Dy
Atomic Number: 66
Atomic Mass: 162.5 amu
Melting Point: 1412.0 °C (1685.15 K, 2573.6 °F)
Boiling Point: 2562.0 °C (2835.15 K, 4643.6 °F)
Number of Protons/Electrons: 66
Number of Neutrons: 97
Classification: Rare Earth
Crystal Structure: Hexagonal
Density @ 293 K: 8.536 g/cm³
Color: Unknown

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
Dy-154	3000000.0 years
Dy-156	Stable
Dy-157	8.1 hours
Dy-158	Stable
Dy-159	144.4 days
Dy-160	Stable
Dy-161	Stable
Dy-162	Stable
Dy-163	Stable
Dy-164	Stable
Dy-165	2.3 hours
Dy-166	3.4 days

Facts

Date of Discovery: 1886
Discoverer: Paul Emile Lecoq de Boisbaudran
Name Origin: From the Greek word dysprositos (hard to get at)
Uses: nuclear reactors
Obtained From: erbium, holmium

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