Question

PLEASE HELP EASY MEDAL
According to early chemists, which substances were classified as elements?
A. those that had an atomic mass that could be measured
B. those that had higher numbers of protons in their atoms
C. those that could not be broken down further by chemical means
D. those that could not be broken down further by physical means

Answer 1

I think it is D

Answer 2

D sounds like it is correct, better probably to ask this question in a chemistry section :)

Answer 3

thank you :)