A. All atoms of all elements are the same size. B. Atoms of different<span> elements always combine in one-one ratios. C. Atoms of the same element are always</span>identical<span>. Which of the following was originally a part of Dalton's atomic theory, but had to be revised about a century ago?</span>
Answer:
Science...Only the form changes.Kinetic energy changes.
Explanation:
SCIENCE
The first one is the answer
isotopes of an atom have different number of neutrons . the number of protons are not different in isotopes of an atom