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  • ...pton]] (Kr), [[xenon]] (Xe), and the radioactive [[radon]] (Rn) as well as oganesson (Og), though the latter's properties are still debated. ===Oganesson===
    3 KB (450 words) - 16:53, 23 December 2021
  • ..., copernicium, nihonium, flerovium, moscovium, livermorium, tennessine and oganesson. This period contains the heaviest element which occurs naturally on Earth,
    5 KB (730 words) - 13:40, 9 January 2022