Rn
Radon
العنصر 86 · 222.01758 u
Radon is a radioactive noble gas and the second leading cause of lung cancer after smoking.
Physical Properties
| الكتلة الذرية | 222.01758 u |
| الكثافة | 0.00973 g/cm³ |
| Melting Point | 202.0 K |
| نقطة الغليان | 211.3 K |
| المظهر | Colorless gas |
| State at Room Temp | Gas |
الخواص الكيميائية
| السالبية الكهربائية | 2.2 (Pauling) |
| طاقة التأين الأولى | 1037.0 kJ/mol |
| القرب الإلكتروني | -68.0 kJ/mol |
| Oxidation States | +2, +6 |
الخصائص الذرية
| تشكيل الإلكترون | [Xe] 4f14 5d10 6s2 6p6 |
| نصف قطر الذرة | 150.0 pm |
| نصف قطر التكافؤ | 150.0 pm |
| Van der Waals Radius | 220.0 pm |
اكتشاف
| اكتشفها | Friedrich Ernst Dorn |
| سنة الاكتشاف | 1900 |
| الموقع | Halle, Germany |
| Named After | Named after radium, from which it is produced |
عن Radon
Radon is a colorless, odorless radioactive gas formed from radium decay. It is the densest gas known. Radon seeps from the ground and accumulates in basements, causing thousands of lung cancer deaths per year.
Uses & Applications
Radon testing in buildings, earthquake prediction research, and hydrological research.
حقيقة مضحكة
Radon is the second leading cause of lung cancer after smoking, yet it is odorless and invisible. The EPA recommends testing all homes.
النظائر
| Mass Number | الوفرة | نصف العمر | Stable |
| 211 | - | 14.6 hours | No |
| 220 | - | 55.6 seconds | No |
| 222 | - | 3.8235 days | No |
تشكيل الإلكترون
[Xe] 4f14 5d10 6s2 6p6