Final answer:The atomic symbol for a mercury isotope with 122 neutrons is 20280Hg, where '202' is the mass number calculated by adding the atomic number of mercury (80) to the number of neutrons (122).Explanation:The atomic symbol for a mercury (Hg) isotope with 122 neutrons can be derived using the atomic number of mercury and the number of neutrons given.Mercury has an atomic number of 80, which means it has 80 protons. To find the mass number (A) of this isotope, you add the number of protons to the number of neutrons: A = 80 protons + 122 neutrons = 202.The nuclear symbol of an isotope includes the element symbol (Hg for mercury), the mass number, and the atomic number. So, for mercury with 122 neutrons, the complete atomic symbol would be Hg-202.The mass number is placed as a superscript to the upper left of the element symbol and, although typically omitted since it's a property of the element, the atomic number is placed as a subscript to the lower left of the element symbol. Therefore, the isotope of mercury with 122 neutrons is represented as 20280Hg....

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