Elements / 43
43Tc[98]
Technetium
Transition metal · d-block · ring O · spoke 7
Technetium is element 43, a transition metal. It sits on ring O (period 5) on spoke 7. Follow that spoke toward the center and out again to find its chemical relatives.
Properties
| Density | 11 g/cm³ | Terrain → |
|---|---|---|
| Melting point | 2,430 K · 2,157 °C10th highest melting point of 97 | Terrain → |
| Boiling point | 4,538 K · 4,265 °C10th highest boiling point of 96 | Terrain → |
| Electronegativity | 1.90 | Terrain → |
| First ionization energy | 702 kJ/mol | Terrain → |
| Atomic weight | 98 u | Terrain → |
| Crustal abundance | 3.0 × 10⁻¹⁵ ppm | Terrain → |
| Discovered | 1937 | 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
- Confirmed in 1937 in Palermo, in a foil Ernest Lawrence mailed from a cyclotron deflector. In 1952 Paul W. Merrill spotted it in red giants.
- Lightest element with only radioactive isotopes; its name is Greek for artificial, and it serves ten million diagnostic procedures a year.
Checked against en.wikipedia.org.
Spoke 7
Ring O (period 5)
Play with Technetium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.