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What is the atomic number for an element whose mass number is 78, which contains 36 neutrons per atom?

What is the atomic number for an element whose mass number is 78, which contains 36 neutrons per atom?
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What is the atomic number for an element whose mass number is 78, which contains 36 neutrons per atom?

User Jack Tileman
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The atomic number for an element whose number is 78 and contains 36 neutrons per atom is 42.
User JSantos
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