Elements / 72
72Hf178.49
Hafnium
Transition metal · d-block · ring P · spoke 4
Hafnium is element 72, a transition metal. It sits on ring P (period 6) on spoke 4. Follow that spoke toward the center and out again to find its chemical relatives.
Properties
| Density | 13.3 g/cm³ | Terrain → |
|---|---|---|
| Melting point | 2,506 K · 2,233 °C9th highest melting point of 97 | Terrain → |
| Boiling point | 4,876 K · 4,603 °C8th highest boiling point of 96 | Terrain → |
| Electronegativity | 1.30 | Terrain → |
| First ionization energy | 659 kJ/mol | Terrain → |
| Atomic weight | 178.492 u | Terrain → |
| Crustal abundance | 3 ppm | Terrain → |
| Discovered | 1922 | Terrain → |
Values from open reference data; see sources. "Terrain" opens that property as a 3D landscape across the whole spiral.
Two things you might not know
- Its 1923 discovery validated Mendeleev's 1869 prediction; it is chemically nearly identical to zirconium.
- Named for the Latin name of Copenhagen; much of it goes into reactor control rods, including in US naval submarines.
Checked against en.wikipedia.org.
Spoke 4
Ring P (period 6)
Play with Hafnium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.