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After the Pauling electronegativity (1,13) promethium is a reactive metal but the chemistry of Pm is only superficially known.
The valence of ions in solution is +3. Promethium compounds known: halides, oxides, nitrates, sulfates, hydroxides etc.

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8y ago
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9y ago

Some physical properties of promethium are it is a metal, solid and has an atomic weight of 145. One of its chemical properties is that it is unstable.

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8y ago

It is estimated that the Vickers hardness of promethium is 617,8 MPa.

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Q: What are the physical and chemical properties of promethium?
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