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Answer:

Symbol =  I

Explanation:

Isotopes are those substances which have same atomic number (Numbers of protons) and different masses (Number of proton + numbers of neutrons).

  • Iodine also have many isotopes like

Iodine-125 that contain 53 protons, 72 neutrons.

Iodine-128  that contain 53 protons, 75 neutrons.

Iodine-129 that contain 53 protons, 76 neutrons.

Iodine-131 that contain 53 protons, 78 neutrons.

Summary:

  • Here the Iodine-131 is correct answer of this question.

pstnonsonjoku

The atomic number is 53 and the mass number is 131 hence the proper symbol of the element is 131/53 I.

What is atomic number?

The atomic number is the identity of the element. In this case we know that the element that has atomic number 53 is iodine. We shall now know which isotope of iodine from the mass number.

The mass number of iodine is 131. The mass number is written as a superscript while the atomic number (53) is the subscript. Hence, the proper symbol of the element is 131/53 I.

Learn more about isotope: https://brainly.com/question/15167411

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