Tl
Thallium is a highly toxic post-transition metal once used as rat poison.
Physical Properties
| পদাৰ্থ | 204.38 u |
| ঘনত্ব | 11.85 g/cm³ |
| Melting Point | 577.0 K |
| উত্তাপৰ বিন্দু | 1746.0 K |
| আকৃতি | Silvery-white metallic |
| State at Room Temp | Solid |
রাসায়নিক বৈশিষ্ট্যসমূহ
| ইলেকট্ৰোনেজেটিভিটি | 1.62 (Pauling) |
| 1- তম আইনাইজেশন শক্তি | 589.4 kJ/mol |
| ইলেকট্ৰন | 19.2 kJ/mol |
| Oxidation States | +1, +3 |
প্ৰমাণপত্ৰৰ বৈশিষ্ট্য
| ইলেকট্ৰন | [Xe] 4f14 5d10 6s2 6p1 |
| পৰমাণু | 170.0 pm |
| কোভালেন্ট বেৰিয়াড | 145.0 pm |
| Van der Waals Radius | 196.0 pm |
ডিস্কভাৰী
| আবিষ্কাৰ কৰা হৈছে | William Crookes |
| আবিষ্কাৰৰ বছৰ | 1861 |
| অৱস্থান | London, England |
| Named After | Greek 'thallos' meaning green shoot, from its bright green spectral line |
বিষয়ে Thallium
Thallium is a soft, silvery-white metal that is extremely toxic. It was historically used as a murder weapon due to its tastelessness and was banned as rat poison in many countries.
Uses & Applications
Semiconductor devices, infrared optics, medical imaging, and specialized glass.
মজা কথা
Thallium was the 'poisoner's poison' -- tasteless, odorless, and its symptoms mimicked common illnesses.
আইসোটোপ
| Mass Number | অভাৱ | হাফ-লাইফ | Stable |
| 203 | 0.2952% | - | Yes |
| 205 | 0.7048% | - | Yes |
ইলেকট্ৰন
[Xe] 4f14 5d10 6s2 6p1