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No, isotopes do not occupy rows of equal height. Isotopes are variants of an element that have the same number of protons but different numbers of neutrons. They are typically represented in the periodic table by placing the atomic symbol, followed by a hyphen and the mass number of the isotope, above the element's atomic number. Isotopes are placed in the same row as their respective element, but their positions within the row are determined by their atomic mass. Therefore, isotopes with different numbers of neutrons and different atomic masses will have different positions within the row.