Kr
Krypton is a noble gas used in fluorescent lamps and photographic flash equipment.
Physical Properties
| الكتلة الذرية | 83.798 u |
| الكثافة | 0.003733 g/cm³ |
| Melting Point | 115.79 K |
| نقطة الغليان | 119.93 K |
| المظهر | Colorless gas, whitish glow in discharge |
| State at Room Temp | Gas |
الخواص الكيميائية
| السالبية الكهربائية | 3.0 (Pauling) |
| طاقة التأين الأولى | 1350.8 kJ/mol |
| القرب الإلكتروني | -96.0 kJ/mol |
| Oxidation States | +2 |
الخصائص الذرية
| تشكيل الإلكترون | [Ar] 3d10 4s2 4p6 |
| نصف قطر الذرة | 88.0 pm |
| نصف قطر التكافؤ | 116.0 pm |
| Van der Waals Radius | 202.0 pm |
اكتشاف
| اكتشفها | William Ramsay, Morris Travers |
| سنة الاكتشاف | 1898 |
| الموقع | London, England |
| Named After | Greek 'kryptos' meaning hidden |
عن Krypton
Krypton is a colorless, odorless, tasteless noble gas in trace amounts in the atmosphere. From 1960 to 1983, the meter was defined by krypton-86 emission. Krypton can form compounds with fluorine.
Uses & Applications
Fluorescent lamps, flash photography, insulating windows, and formerly used to define the standard meter.
حقيقة مضحكة
Despite its name, krypton has nothing to do with Superman -- it was named from Greek for 'hidden' in 1898, decades before the comic character.
النظائر
| Mass Number | الوفرة | نصف العمر | Stable |
| 82 | 0.11593% | - | Yes |
| 83 | 0.115% | - | Yes |
| 84 | 0.56987% | - | Yes |
| 86 | 0.17279% | - | Yes |
تشكيل الإلكترون
[Ar] 3d10 4s2 4p6