Ir
Iridium is the most corrosion-resistant metal and provided key evidence for the dinosaur extinction.
Physical Properties
| পদাৰ্থ | 192.22 u |
| ঘনত্ব | 22.56 g/cm³ |
| Melting Point | 2719.0 K |
| উত্তাপৰ বিন্দু | 4701.0 K |
| আকৃতি | Silvery-white metallic |
| State at Room Temp | Solid |
রাসায়নিক বৈশিষ্ট্যসমূহ
| ইলেকট্ৰোনেজেটিভিটি | 2.2 (Pauling) |
| 1- তম আইনাইজেশন শক্তি | 880.0 kJ/mol |
| ইলেকট্ৰন | 150.94 kJ/mol |
| Oxidation States | +1, +2, +3, +4, +5, +6 |
প্ৰমাণপত্ৰৰ বৈশিষ্ট্য
| ইলেকট্ৰন | [Xe] 4f14 5d7 6s2 |
| পৰমাণু | 136.0 pm |
| কোভালেন্ট বেৰিয়াড | 141.0 pm |
| Van der Waals Radius | 202.0 pm |
ডিস্কভাৰী
| আবিষ্কাৰ কৰা হৈছে | Smithson Tennant |
| আবিষ্কাৰৰ বছৰ | 1803 |
| অৱস্থান | London, England |
| Named After | Latin 'iris' meaning rainbow, for its colorful salts |
বিষয়ে Iridium
Iridium is a very hard, brittle, silvery-white metal resistant to all acids and molten metals. An iridium-rich layer in geological strata worldwide proved the asteroid impact that caused dinosaur extinction.
Uses & Applications
Spark plugs, crucibles for crystal growth, and deep-sea drilling pipe.
মজা কথা
A thin layer of iridium in 66-million-year-old rock worldwide proved an asteroid caused the dinosaur extinction.
আইসোটোপ
| Mass Number | অভাৱ | হাফ-লাইফ | Stable |
| 191 | 0.373% | - | Yes |
| 193 | 0.627% | - | Yes |
ইলেকট্ৰন
[Xe] 4f14 5d7 6s2