Neptunium
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| General Properties | ||||||||
|---|---|---|---|---|---|---|---|---|
| Atomic number | Predicted atomic mass | Half-life of longest living isotope | Electron Configuration | Density | Melting point | Boiling point | First discovered | |
| 93 | 237amu | Around 2.1 million years | [Rn] 5f4 6d1 7s2 | 20.2g/cm3 | 644°C | 3902°C | 1940 | |
| General Properties | |
|---|---|
| Atomic number | 93 |
| Atomic mass | 237amu |
| Half-life of longest living isotope | Around 2.1 million years |
| Electron Configuration | [Rn] 5f4 6d1 7s2 |
| Density | 20.2g/cm3 |
| Melting point | 644°C |
| Boiling point | 3902°C |
| First discovered | 1940 |
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Description and uses
Neptunium is the 93rd element of the periodic table. It was discovered in 1940 when Edwin McMillan and Philip Abelson created it through neutron bombardment of
uranium. Its longest living isotope is 237Np, with a half life of around 2.1 million years. It has its own decay
chain called the neptunium series, the next element in the series being protactinium.