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Periodic Table
Atoms and Atomic Structure

What type of element is a protactinium?


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October 18, 2019 8:00AM
I'm not too bad at chemistry, but one thing I can't wrap my head around is how perfect the periodic table is. How is it that each element that we know is only one more proton than the last? How come it goes in PERFECT order instead of having a few elements with protons not perfectly linear to the periodic table?
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January 02, 2013 4:01PM

A highly radioactive metal and weakly basic actinide.