State whether the following statement is true or false:

Radioactive isotope of iodine is used for making the medicine called tincture iodine.

Which radioactive isotope is used to determine the activity of thyroid gland?

State one use of radioactive isotopes in industry.

What name is given to those atoms which contain the same number of protons and electrons but different number of neutrons?

What is the relationship between an atom containing 11 protons, 11 electrons ad 11 neutrons, and another atom containing 11 protons, 11 electrons and 12 neurtrons?