Final answer:
The atomic symbol for iodine-130 is represented with the mass number as a superscript and the atomic number as a subscript to the left of the element's symbol, hence iodine-130 is written as 130/53 I. Option a, 130/53 I, is the correct answer.
Step-by-step explanation:
The atomic symbol for iodine-130 is represented by the mass number (which is the sum of the number of protons and neutrons) being placed as a superscript to the left of the chemical symbol and the atomic number (the number of protons in the nucleus) as a subscript to the left. For iodine, which has an atomic number of 53, the representation of iodine-130 would be the mass number 130 as a superscript and the atomic number 53 as a subscript followed by the chemical symbol I.
Therefore, the correct atomic symbol for iodine-130 is 130/53 I. The options given in the question led to the selection of a. 130/53 I as the correct answer because it properly represents the isotope of iodine with a mass number of 130.