Se
Selenium is an essential trace element used in electronics and dietary supplements.
Physical Properties
| পদাৰ্থ | 78.971 u |
| ঘনত্ব | 4.809 g/cm³ |
| Melting Point | 494.0 K |
| উত্তাপৰ বিন্দু | 958.0 K |
| আকৃতি | Red to gray, black in vitreous form |
| State at Room Temp | Solid |
রাসায়নিক বৈশিষ্ট্যসমূহ
| ইলেকট্ৰোনেজেটিভিটি | 2.55 (Pauling) |
| 1- তম আইনাইজেশন শক্তি | 941.0 kJ/mol |
| ইলেকট্ৰন | 195.0 kJ/mol |
| Oxidation States | -2, +2, +4, +6 |
প্ৰমাণপত্ৰৰ বৈশিষ্ট্য
| ইলেকট্ৰন | [Ar] 3d10 4s2 4p4 |
| পৰমাণু | 103.0 pm |
| কোভালেন্ট বেৰিয়াড | 120.0 pm |
| Van der Waals Radius | 190.0 pm |
ডিস্কভাৰী
| আবিষ্কাৰ কৰা হৈছে | Jons Jacob Berzelius |
| আবিষ্কাৰৰ বছৰ | 1817 |
| অৱস্থান | Stockholm, Sweden |
| Named After | Greek 'selene' meaning moon |
বিষয়ে Selenium
Selenium has properties between sulfur and tellurium. Its conductivity changes with light, making it useful in photoconductors. It is an essential trace element as a component of selenocysteine.
Uses & Applications
Photovoltaic cells, photocopiers, glass manufacturing, dietary supplements, and semiconductors.
মজা কথা
Selenium is essential in tiny amounts but toxic in larger doses. Brazil nuts are the richest known dietary source.
আইসোটোপ
| Mass Number | অভাৱ | হাফ-লাইফ | Stable |
| 76 | 0.0937% | - | Yes |
| 78 | 0.2377% | - | Yes |
| 80 | 0.4961% | - | Yes |
| 82 | 0.0873% | - | Yes |
ইলেকট্ৰন
[Ar] 3d10 4s2 4p4