- How do you find how many unpaired electrons there are in a element??

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MATH HELP PLEASE SIMPLE? What is the square root of -66? What is the suffix for an alcohol, ester, ether carboxlic acid etc? If my grade on blackboard is 987/1000, what is my actual grade? Would a clock moving at near light speed nearly lose all its mass, does it mean the faster the motion of mass the smaller it gets?