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QUESTION

What is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

""_53^131"I"

The is the number of protons in the nuclei of the element's atoms, is designated Z, and is written as a subscript in front of the element's symbol. The , A, is the sum of the protons, Z, and neutrons, N, and is written as a superscript in front of the element's symbol.