![[ATOM]](atom.gif) |
Hafnium
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Information valid for Hf-178 unless otherwise noted
Basic Information
Symbol: Hf
Atomic Number: 72
Mass: 178.49
Melting Point: 2150.0 C
Boiling Point: 5400.0 C
Number of Protons/Electrons: 72
Number of Neutrons: 106
Classification: Transition Metal
Crystal Structure: Hexagonal
Density @ 293 K: 13.2 g/cm3
Color: Silver
Atomic Structure
![[Bohr Model of Hafnium]](b0072.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: 32
Fifth Energy Level: 10
Sixth Energy Level: 2
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Isotopes
| Isotope |
Half Life |
| Hf-172 |
1.9 years |
| Hf-174 |
2.0E15 years |
| Hf-175 |
70.0 days |
| Hf-176 |
Stable |
| Hf-177 |
Stable |
| Hf-178 |
Stable |
| Hf-179 |
Stable |
| Hf-180 |
Stable |
| Hf-182 |
Stable |
| Hf-182 |
Stable |
Facts
Date of Discovery: 1923
Discoverer: Dirk Coster
Name Origin: From the Latin word Hafnia (Copenhagen)
Uses: nuclear reactors
Obtained From: zircon