Answer: There are 
atoms present in 0.500 mol of 
.
Explanation:
According to the mole concept, there are 
atoms present in 1 mole of a substance.
In a molecule of there is only one carbon atom present. Therefore, number of carbon atoms present in 0.500 mol of are as follows.
Thus, we can conclude that there are atoms present in 0.500 mol of .
He used a magnet to find that the negatively charged particles to be smaller then the atom.
He discovered electrons.
They'd observe any new substances or new color, and temp. that is irreversible.
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XX is female and X,Y is male so the answer is
XX, XY, XX, XY, XY, XX
