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neptunium (Np)

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inglese
A neptunium atom has 93 protons and 93 electrons, of which seven are valence electrons.
en.wikipedia.org
The actual element was discovered several years later, and assigned the name neptunium.
en.wikipedia.org
This was the fifth transuranium element discovered after neptunium, plutonium, curium and americium.
en.wikipedia.org
By weight, neptunium-237 discharges are about 5% as great as plutonium discharges and about 0.05% of spent nuclear fuel discharges.
en.wikipedia.org
This amount declines slowly as the americium decays into neptunium-237, a different transuranic element with a much longer half-life (about 2.14 million years).
en.wikipedia.org
Neptunium dioxide has also been show to contribute to increased decay rates of radioactive metals, an application which is currently being explored.
en.wikipedia.org
The relative order of the middle two neptunium ions depends on the ligands and solvents used.
en.wikipedia.org
Neptunium has valence states from 3 to 7, which can be simultaneously observed in solutions.
en.wikipedia.org
The element 93 was synthesised in 1940 and named neptunium.
en.wikipedia.org
It is a stable ion and is the most common form of neptunium in aqueous solutions.
en.wikipedia.org

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