Actinon

{
  "id": "MLC-T-MET-003270",
  "term": "Actinon",
  "field": "Meteorology and atmospheric science",
  "definition": "An obsolete name for the isotope Radon-219 (219Rn), a naturally occurring radioactive noble gas. It is a decay product in the actinium decay series, with a very short half-life of approximately 3.96 seconds. Due to its rapid decay, its atmospheric concentration is extremely low and its role in atmospheric processes is negligible compared to Radon-222.",
  "url": "https://mlchart.com/terminology/meteorology/actinon/"
}