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Identifying Element from Number of Protons and Neutrons

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An unknown element which has 120 protons and 174 neutrons, has the name ultimatum and symbol Ul.

Give the atomic number of ultimatum and give the full symbol for the above isotope.

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The solution gives not only the answers but also the steps required to arrive at the answer.

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Number of protons = number of electrons

Hence, the atomic number = 120

mass = ...

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