// MATTER · ELEMENT 42 / 118atoms.no/elements
Mo42
Molybdenum
Mo·Z 42·Transition Metal·95.95·⭕ 7B · F Major
▸ The reading
interpretive · artAlmost every nitrogen-fixing bacterium on Earth runs its nitrogenase enzyme around a molybdenum atom — the planet's nitrogen cycle is catalysed at this seat. In steel it holds strength at red heat. A hinge element: remove it and both the field's fertility and the tool's temper fail.
The science below is cited as science; the symbolic layers are flagged as interactive art.
⚜ Periodic Frequency
7BF Major
a seat struck in brass — testimony, not prediction
the seat has its own room on ⭕ THE OVAL TABLE — tap the code
▸ The lenses
▸ Discovery
Peter Jacob Hjelm — reduced MoO₃ with carbon · Sweden · 1781
▸ Stellar origin
s-process + r-process branchingIts neutron-capture isotopes (⁹⁵–¹⁰⁰Mo) divide roughly evenly between slow and rapid capture, but ⁹²Mo and ⁹⁴Mo come from neither — about 24% of molybdenum is p-process, the largest such share of any element.
▸ Reactivity
Holds strength at red-heat temperaturesHighest melting point among second-row transition metals (2623 °C). Steel with Mo holds its edge in heavy-duty cutting tools.
▸ Applications
- High-strength steel alloys (tools, armor)
- Catalysts for petroleum refining
- X-ray tube anodes
- Nitrogenase enzyme cofactor (microbial nitrogen fixation)
▸ Curiosity
Almost every nitrogen-fixing bacterium on the planet uses a molybdenum atom at the heart of its nitrogenase enzyme — Earth's nitrogen cycle is largely Mo-catalyzed.
▸ Related readings
a resonance drawn between readings — not a claim that they share an origin.
Group 6CrChromiumWTungsten
Period 5NbNiobiumTcTechnetium
d-blockNbNiobiumTcTechnetium
Adjacent ZNbNiobiumTcTechnetium