[English name] uranium

[structure or molecular formula]

[density] 19.04

[melting point (°C)] 1132

[Boiling point (°C)] 3818

【Properties】

The new cut surface is silvery white with a dense texture. Darkens in the air to form an oxide film that can be washed away with dilute nitric acid.

【use】

A natural radioactive element. Uranium 235 is an important nuclear fuel used in the atomic energy industry and in the manufacture of nuclear weapons. Uranium 234 and 238 are also used in the fuel of nuclear reactors.

[preparation or source]

Uranium metal may be calcium or magnesium, by reducing uranium tetrafluoride at a high temperature of 1200 ~ 1400 ℃ in a closed container with the system. In addition, from the uranyl nitrate, after the uranium trioxide, uranium dioxide, uranium tetrafluoride and finally reduced, metal uranium can be obtained.

【other】

The atomic number is 92, the atomic weight is 238.02891, and the valence is +3, +4, +5, +6. Uranium reacts with non-metals (except inert gases) and various metals, acts with acids, and does not work with caustic.

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