Name: Hafnium
Symbol: Hf
Atomic Number: 72
Atomic Mass: 178.49 amu
Melting Point: 2150.0 °C (2423.15 °K, 3902.0 °F)
Boiling Point: 5400.0 °C (5673.15 °K, 9752.0 °F)
Number of Protons/Electrons: 72
Number of Neutrons: 106
Crystal Structure: Hexagonal
Density @ 293 K: 13.2 g/cm3
Color: Silver
Atomic Structure
![[Bohr Model of Hafnium]](b0072.gif) |
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 |
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: 1923Discoverer: Dirk Coster
Name Origin: From the Latin word Hafnia (Copenhagen)
Uses: nuclear reactors
Obtained From: zircon
Information provided by: http://www.chemicalelements.com