Rb
Rubidium is a highly reactive alkali metal that ignites spontaneously in air.
Physical Properties
| পদাৰ্থ | 85.468 u |
| ঘনত্ব | 1.532 g/cm³ |
| Melting Point | 312.46 K |
| উত্তাপৰ বিন্দু | 961.0 K |
| আকৃতি | Silvery-white metallic |
| State at Room Temp | Solid |
রাসায়নিক বৈশিষ্ট্যসমূহ
| ইলেকট্ৰোনেজেটিভিটি | 0.82 (Pauling) |
| 1- তম আইনাইজেশন শক্তি | 403.0 kJ/mol |
| ইলেকট্ৰন | 46.9 kJ/mol |
| Oxidation States | +1 |
প্ৰমাণপত্ৰৰ বৈশিষ্ট্য
| ইলেকট্ৰন | [Kr] 5s1 |
| পৰমাণু | 248.0 pm |
| কোভালেন্ট বেৰিয়াড | 220.0 pm |
| Van der Waals Radius | 303.0 pm |
ডিস্কভাৰী
| আবিষ্কাৰ কৰা হৈছে | Robert Bunsen, Gustav Kirchhoff |
| আবিষ্কাৰৰ বছৰ | 1861 |
| অৱস্থান | Heidelberg, Germany |
| Named After | Latin 'rubidus' meaning deep red, from its bright red spectral lines |
বিষয়ে Rubidium
Rubidium is a soft, silvery-white metallic element that is the second most electropositive element. It ignites in air and reacts violently with water. It is used in atomic clocks due to its precise spectral lines.
Uses & Applications
Atomic clocks, specialty glass, fireworks (purple color), photocells, and medical imaging.
মজা কথা
Rubidium atomic clocks are so precise they would not lose a second in several hundred million years.
আইসোটোপ
| Mass Number | অভাৱ | হাফ-লাইফ | Stable |
| 85 | 0.7217% | - | Yes |
| 87 | 0.2783% | 49.23 billion years | No |
ইলেকট্ৰন
[Kr] 5s1