Answer;
53 protons
73 neutrons
The mass number of iodine is 126, and it’s in the 53rd place in the periodic table. It has 73 protons and 53 neutrons.
Explanation;
- The mass number of an element is the sum of the number of protons and the number of neutrons in the nucleus of an atom of the element.
- Therefore, the mass number of Iodine is 126, which means the sum of its protons and neutrons is 126.
- Atomic number of an atom on the other hand is the number of protons in the nucleus of the atom. The atomic number of Iodine is 53 , which means its nucleus has 53 protons.
- Thus, to get the number of neutrons we subtract the atomic number from the mass number, which will be 73 neutrons.