Cs
Cesium is the most electropositive stable element and defines the second in atomic clocks.
Physical Properties
| পদাৰ্থ | 132.91 u |
| ঘনত্ব | 1.873 g/cm³ |
| Melting Point | 301.59 K |
| উত্তাপৰ বিন্দু | 944.0 K |
| আকৃতি | Silvery gold metallic |
| State at Room Temp | Solid |
রাসায়নিক বৈশিষ্ট্যসমূহ
| ইলেকট্ৰোনেজেটিভিটি | 0.79 (Pauling) |
| 1- তম আইনাইজেশন শক্তি | 375.7 kJ/mol |
| ইলেকট্ৰন | 45.5 kJ/mol |
| Oxidation States | +1 |
প্ৰমাণপত্ৰৰ বৈশিষ্ট্য
| ইলেকট্ৰন | [Xe] 6s1 |
| পৰমাণু | 265.0 pm |
| কোভালেন্ট বেৰিয়াড | 244.0 pm |
| Van der Waals Radius | 343.0 pm |
ডিস্কভাৰী
| আবিষ্কাৰ কৰা হৈছে | Robert Bunsen, Gustav Kirchhoff |
| আবিষ্কাৰৰ বছৰ | 1860 |
| অৱস্থান | Heidelberg, Germany |
| Named After | Latin 'caesius' meaning sky blue, from its spectral lines |
বিষয়ে Cesium
Cesium is a soft, silvery-gold alkali metal with a melting point of 28.44 degrees C. It is extremely reactive and pyrophoric. Cesium-133 defines the second in the SI system.
Uses & Applications
Atomic clocks, drilling fluids, photoelectric cells, and radiation therapy.
মজা কথা
The official definition of one second is exactly 9,192,631,770 oscillations of the cesium-133 atom.
আইসোটোপ
| Mass Number | অভাৱ | হাফ-লাইফ | Stable |
| 133 | 1.0% | - | Yes |
ইলেকট্ৰন
[Xe] 6s1