Spears and knives
(Plz thank me if this helped)
Atom is the correct answer i believe
The graphite of the pencil sits on top of the paper and won't affect the results. If you use ink, it will seep into the paper and itself be subjected to the chromatographic process.
Hope this helped :)
Answer:
opposite of a proton is an electron
your answer is C. considered a mixed success.