Question

12 Write two important applications of isotopes.
13 An atom with 3 protons and 4 neutrons, what will be its valency?
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Answer 1

Answer:

12. First example: Isotopes of iodine is used in radiotherapy in treatment of hyperthyroidsim or cancer, etc

Second example: Cobalt isotopes are used for irradiation of food products

I only can answer no 12. I'm sorry for the inconvenience. I hope this helps :)