Isotopes of neptunium

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Science and technology

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What Wikipedia says

Neptunium (93Np) is usually considered an artificial element, although trace quantities are found in nature, so a standard atomic weight cannot be given. Like all trace or artificial elements, it has no stable isotopes.

Excerpt from the Wikipedia article “Isotopes of neptunium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia