Radon

Kemiallinen merkki: Ra
Järjestysluku: 86
Kategoria: jalokaasut
Ryhmä: 18
Jakso: 6
Lohko: p
Moolimassa: (222) g/mol
Elektronia kuorilla: 2, 8, 18, 32, 18, 8
CAS-numero: 10043-92-2
Olomuoto: kaasu
Tiheys: 9,73 g/l (0 °C, 101,325 kPa)
Sulamispiste: 202 K (-71,15 °C, -96 °F)
Kiehumispiste: 211,3 K (-61,85 °C, -79,1 °F)
Kiderakenne: cubic face centered
Hapetusluvut: 0
Elektronegatiivisuus: 2,2 (Pauling-asteikko)
Nimen alkuperä: radium emanation
Nimen tarkoitus: a shortened version of the phrase - emanation is from the Latin word 'emanatio' (expiration)
Faktoja:
- is a colorless, odorless, tasteless, naturally occurring, radioactive noble gas that is formed from the decay of radium
- is one of the heaviest substances that remains a gas under normal conditions and is considered to be a health hazard
- the most stable isotope, radon-222, has a half- life of 3,8 days
- will continue to exist indefinitely at about the same levels as it is now
- is responsible for the majority of the mean public exposition to ionizing radiations, it is often the single largest contributor to an individual's background radiation dose
- is reportedly the second most frequent cause of lung cancer, after cigarette smoking; and radon- induced lung cancer the 6th leading cause of cancer death overall
- the radon itself isn't very dangerous, but its radioactive decay products are - polonium-218 and 214 - which remain lodged in the lungs, and continue to decay, causing continued exposure by emitting alpha radiations