type the correct answer in each box. the mass number of iodine is 126, and its in the 53rd place in the…

Explanation:

Step1: Recall proton - atomic number relation

The atomic number is equal to the number of protons. Iodine is in the 53rd place in the periodic table, so the atomic number is 53. Thus, the number of protons is 53.

Step2: Calculate number of neutrons

The mass number is the sum of protons and neutrons. Given mass number $A = 126$ and number of protons $p=53$. Let the number of neutrons be $n$. Then $A=p + n$, so $n=A - p$. Substituting the values, we get $n = 126-53=73$.

Answer:

53, 73