Neptunium
From Citizendium, the Citizens' Compendium
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Neptunium is a synthetic chemical element, having the chemical symbol Np. Its atomic number (the number of protons) is 93. The most stable isotope has a mass of (237), a half-life of 2.1 million years and is typically found as a solid in its elemental form.
Neptunium has a boiling point of 3900°C.
