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I found in the tables of G. Audi, A. H. Wapstra and C. Thibault seven isotopes having a mass of approx. 264: 102No, 103Lr, 104Rf, 105Db, 106Sg, 107Bh, 108Hs.

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βˆ™ 15y ago
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βˆ™ 11y ago

Nobelium is credited with a standard atomic weight of [259]; but also Fm, Md, Rf, Db, Sg have isotopes with an Atomic Mass 259.

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βˆ™ 8y ago

Uranium has an isotope with an atomic mass of 234. This accounts for approx 0.0054% of Uranium.

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βˆ™ 14y ago

I'm pretty sure that's Se (Selenium)

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βˆ™ 8y ago

Nobelium

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Q: What element has an atomic mass of 234?
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