| 11. | This particular isotope of neptunium has a mass of 236.04657 u.
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| 12. | Neptunium is found in at least three allotropes.
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| 13. | One neptunium-based Pd 5 Al 2.
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| 14. | It decays by emitting alpha particles and gamma radiation to become neptunium-237.
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| 15. | The actual element was discovered several years later, and assigned the name neptunium.
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| 16. | Neptunium is the only element that can stabilize the ? phase at higher temperatures.
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| 17. | Many of the resulting compounds also have an equivalent compound that substitutes uranium for neptunium.
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| 18. | These are actinides other than uranium and plutonium and include neptunium, americium and curium.
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| 19. | Similarly, compare Uranus with Uranium, Neptune with Neptunium, and Pluto with Plutonium.
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| 20. | Similar species exist for neptunium and plutonium.
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