Question

What is the isotope symbol for iodine-131?

Answer 1

The isotope symbol for iodine-131 is `""_53^131"I"`.

Explanation:

The isotope symbol, called isotope notation or nuclear notation indicates both the atomic number, `"Z"`, and the mass number, `"A"` of an isotope. The mass number is written as a superscript on the left-hand side of the element's chemical symbol, `"X"`. The atomic number (no. of protons) is written as a subscript on the left-hand side of the element's chemical symbol.

For iodine-131, its mass number (A) is `131`, and its atomic number (Z) is `53`. Therefore, the nuclear notation for iodine-131 is `""_53^131"I"`.