Sm
Samarium is used in powerful magnets and cancer treatment.
Physical Properties
| পদাৰ্থ | 150.36 u |
| ঘনত্ব | 7.52 g/cm³ |
| Melting Point | 1345.0 K |
| উত্তাপৰ বিন্দু | 2067.0 K |
| আকৃতি | Silvery-white metallic |
| State at Room Temp | Solid |
রাসায়নিক বৈশিষ্ট্যসমূহ
| ইলেকট্ৰোনেজেটিভিটি | 1.17 (Pauling) |
| 1- তম আইনাইজেশন শক্তি | 544.5 kJ/mol |
| ইলেকট্ৰন | 15.6 kJ/mol |
| Oxidation States | +2, +3 |
প্ৰমাণপত্ৰৰ বৈশিষ্ট্য
| ইলেকট্ৰন | [Xe] 4f6 6s2 |
| পৰমাণু | 180.0 pm |
| কোভালেন্ট বেৰিয়াড | 198.0 pm |
| Van der Waals Radius | 229.0 pm |
ডিস্কভাৰী
| আবিষ্কাৰ কৰা হৈছে | Lecoq de Boisbaudran |
| আবিষ্কাৰৰ বছৰ | 1879 |
| অৱস্থান | Paris, France |
| Named After | Named after the mineral samarskite, after Russian official Vasili Samarsky-Bykhovets |
বিষয়ে Samarium
Samarium is a moderately hard silvery metal that slowly oxidizes in air. Samarium-cobalt magnets were the first rare earth magnets and remain important for high-temperature applications.
Uses & Applications
Samarium-cobalt magnets, cancer treatment (samarium-153), nuclear reactor control rods, and catalysts.
মজা কথা
Samarium-cobalt magnets operate at up to 700 degrees C, far exceeding neodymium magnets, making them essential for jet engines.
আইসোটোপ
| Mass Number | অভাৱ | হাফ-লাইফ | Stable |
| 147 | 0.1499% | 1.06e11 years | No |
| 149 | 0.1382% | - | Yes |
| 150 | 0.0738% | - | Yes |
| 152 | 0.2675% | - | Yes |
ইলেকট্ৰন
[Xe] 4f6 6s2