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What is the relative atomic mass of uranium?

Wikipedia's featured article on the element assures me that uranium's relative atomic mass is 238.03. The commonest isotope is U-238, mixed with 0.72% of U-235 and 0.005% of U-234, plus traces of a couple of isotopes with smaller mass numbers.

How big is an uranium atom?

Atomic nucleus. The size (diameter) of the nucleus is between 1.6 fm (10 −15 m) (for a proton in light hydrogen) to about 15 fm (for the heaviest atoms, such as uranium ). These sizes are much smaller than the size of the atom itself by a factor of about 23,000 (uranium) to about 145,000 (hydrogen).

What number is uranium on the periodic table?

Uranium is a chemical element with symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons.

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