What are isotopes?, atoms with the same number of protons but different neutrons, atoms with different numbers of electrons, atoms of different elements, none of the above, which pair are isotopes of each other., carbon-12 and carbon-14, Hydrogen and helium, oxygen and nitrogen, sodium and chlorine, the chemical properties of isotopes are:, verry different, slightly different, almost identical, completely opposite, which isotope of carbon is radioactive?, carbon 12, carbon 13, carbon 14, carbon 16, what is the use of iodine?, treating cancer, detecting thyroid disorders, producing electricity, preserving food

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