Ar
Argon is the most abundant noble gas in Earth's atmosphere, comprising nearly 1% of the air.
Physical Properties
| الكتلة الذرية | 39.948 u |
| الكثافة | 0.0017837 g/cm³ |
| Melting Point | 83.8 K |
| نقطة الغليان | 87.3 K |
| المظهر | Colorless gas |
| State at Room Temp | Gas |
الخواص الكيميائية
| طاقة التأين الأولى | 1520.6 kJ/mol |
| القرب الإلكتروني | -96.0 kJ/mol |
| Oxidation States | 0 |
الخصائص الذرية
| تشكيل الإلكترون | [Ne] 3s2 3p6 |
| نصف قطر الذرة | 71.0 pm |
| نصف قطر التكافؤ | 106.0 pm |
| Van der Waals Radius | 188.0 pm |
اكتشاف
| اكتشفها | Lord Rayleigh, William Ramsay |
| سنة الاكتشاف | 1894 |
| الموقع | London, England |
| Named After | Greek 'argon' meaning lazy or inactive |
عن Argon
Argon is a colorless, odorless noble gas making up 0.934% of Earth's atmosphere. It is produced primarily by radioactive decay of potassium-40. Argon is completely inert under normal conditions and was the first noble gas to be discovered.
Uses & Applications
Welding shielding gas, incandescent and fluorescent lighting, insulating gas in windows, and preservation of historic documents.
حقيقة مضحكة
Argon got its name from the Greek word for 'lazy' because it participates in virtually no chemical reactions.
النظائر
| Mass Number | الوفرة | نصف العمر | Stable |
| 36 | 0.003336% | - | Yes |
| 38 | 0.000629% | - | Yes |
| 40 | 0.996035% | - | Yes |
تشكيل الإلكترون
[Ne] 3s2 3p6