Chemistry question!?

Which of the following statements about isotopes of an element is TRUE?

a) isotopes are usually radioactive
b) isotopes differ in the number of nuetrons each has
c) isotopes are not found in nature

thanks

Answer:
isotopes differ in the number of neutrons
the answer is b.
b)
I am a high school science teacher and to me all of those look false. My advice from me to you would be to write a letter to the company saying that their worksheets/textbooks/workbooks are inacurate.

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