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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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OpenStudy (kitten_is_back):
d
OpenStudy (anonymous):
Why are you reasking these?
OpenStudy (kitten_is_back):
HIH>?
OpenStudy (anonymous):
It's A
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