Chemistry
What radioactive metallic element, found in all uranium ores, has an atomic number of 89?
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What is the second-most abundant element in the universe, though it is much less common on Earth?
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What symbol appears on the periodic table for Thorium which has the atomic number 90?
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What is the half-life of Potassium 40 as it decays to Argon?
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What orbital is described by the quantum numbers: n=3 and l=2?
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What symbol appears on the periodic table for the element with the atomic number 92?
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What element is the basis for organic chemistry, as it occurs in all living organisms?
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What is the diffusion of water through a cell membrane called?
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