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