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A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons.
Uranium is weakly radioactive because all its isotopes are unstable (with half-lives of the six naturally known isotopes, uranium-233 to uranium-238, varying between 69 years and 4.5 billion years).
Here is information if you want me to do an appraisal.
But, if you use this resource and the Identifying Your Antiques & Collectibles page, you should be able to find all of the resources that you need to answer your question or start on the correct path to antique identification.
However, because of the tiny amounts found in nature, uranium needs to undergo enrichment so that enough uranium-235 is present.
The art of making decorated porcelain ware originated in China more than 1,000 years ago.
From 960 through 1127, during the Song dynasty, emperors established factories to produce porcelain for the royal family.
The most common isotopes in natural uranium are uranium-238 (which has 146 neutrons and accounts for over 99%) and uranium-235 (which has 143 neutrons).
Uranium has the highest atomic weight of the primordially occurring elements.
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My primary resource for marks is "Lehner's Encyclopedia of U. Marks on Pottery, Porcelain & Clay" by Lois Lehner.