With every electron stationed in its own orbital or paired off with each other in the higher energy level, the energy level is balanced and stable. The atoms that utilize this exception are Molybdenum, Chromium, Gold, Silver, and Copper.
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It would definitely not be A and D so those two are out. B isn't talking about temperature so that one is also out. The only remaining answer would be C which would be the correct one.
I choose the answer:d.potassium nitrate.
