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?

State whether the following statement is true or false:

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

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

What name is given to the pair of atoms such as?

What name is given to those isotopes which have unstable nuclei and emit various types of radiations?