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OpenStudy (kitten_is_back):
How did early chemists determine which substances were elements? A. by observing chemical reactions B. by finding the atomic mass C. by counting neutrons D. by counting protons
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undeadknight26 (undeadknight26):
I would say it would be A :) I don't think they had the technology to do the others.
OpenStudy (anonymous):
obviously, A they can't find or detect anything besides A
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