// MATTER · ELEMENT 19 / 118atoms.no/elements
K19
Potassium
K·Z 19·Alkali Metal·39.1·⭕ 2B · F♯ Major
▸ The reading
interpretive · artPotassium bursts into lilac flame on water and quietly ticks inside every banana — the natural isotope ⁴⁰K makes the fruit measurably radioactive on a 1.25-billion-year half-life. It is the K in the NPK sack that feeds the field. A body-critical alkali metal that cannot stop giving off both sparks and time.
The science below is cited as science; the symbolic layers are flagged as interactive art.
⚜ Periodic Frequency
2BF♯ 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
Humphry Davy — electrolysis of molten potash (KOH) · England · 1807
▸ Stellar origin
Oxygen-burning + supernovaeLate-stage massive-star fusion produces ³⁹K; supernovae also produce the long-lived radioisotope ⁴⁰K, which is why every banana is faintly radioactive.
▸ Reactivity
Bursts into lilac flame on waterMore reactive than sodium. The 'potash' (pot-ash) name comes from leaching wood ashes in iron pots — that residue was the original K₂CO₃ source.
▸ Applications
- Fertilizers (the K in NPK)
- Soap-making
- Gunpowder (KNO₃)
- Nerve and muscle action potentials
▸ Curiosity
Every banana is mildly radioactive thanks to ⁴⁰K — the natural isotope decaying at a half-life of 1.25 billion years.
▸ Related readings
a resonance drawn between readings — not a claim that they share an origin.