Np
Neptunium
উপাদান 93 · 237.04817 u
Neptunium was the first transuranium element discovered.
Physical Properties
| পদাৰ্থ | 237.04817 u |
| ঘনত্ব | 20.45 g/cm³ |
| Melting Point | 917.0 K |
| উত্তাপৰ বিন্দু | 4273.0 K |
| আকৃতি | Silvery metallic |
| State at Room Temp | Solid |
রাসায়নিক বৈশিষ্ট্যসমূহ
| ইলেকট্ৰোনেজেটিভিটি | 1.36 (Pauling) |
| 1- তম আইনাইজেশন শক্তি | 604.5 kJ/mol |
| ইলেকট্ৰন | 45.85 kJ/mol |
| Oxidation States | +3, +4, +5, +6, +7 |
প্ৰমাণপত্ৰৰ বৈশিষ্ট্য
| ইলেকট্ৰন | [Rn] 5f4 6d1 7s2 |
| পৰমাণু | 155.0 pm |
| Van der Waals Radius | 221.0 pm |
ডিস্কভাৰী
| আবিষ্কাৰ কৰা হৈছে | Edwin McMillan, Philip Abelson |
| আবিষ্কাৰৰ বছৰ | 1940 |
| অৱস্থান | Berkeley, California, USA |
| Named After | Named after the planet Neptune, following uranium (Uranus) |
বিষয়ে Neptunium
Neptunium is a silvery radioactive actinide and the first transuranium element discovered. It is produced as a byproduct in nuclear reactors.
Uses & Applications
Neutron detection, precursor for plutonium-238 (space probes), and nuclear research.
মজা কথা
Neptunium was the first synthetic transuranium element, opening the door to all heavier elements.
আইসোটোপ
| Mass Number | অভাৱ | হাফ-লাইফ | Stable |
| 236 | - | 154,000 years | No |
| 237 | - | 2.144 million years | No |
ইলেকট্ৰন
[Rn] 5f4 6d1 7s2