What is the atomic radius? A measure of the size of a neutron.
A measure of the size of a proton.
A measure of the size of an atom.
A measure of the size of a nucleus.

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

c. is the answer

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c) should be the answer.