The number of protons in the nucleus of an atom is 80, while the number of neutrons in the nucleus is 90. What is the mass number of this isotope?

Name: The number of protons in the nucleus of an atom is 80, while the number of neutrons in the nucleus is 90. What is the mass number of this isotope?
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Question

Quizplus · Accepted Answer

The mass number of an isotope is the sum of its protons and neutrons. For this isotope, with 80 protons and 90 neutrons, the mass number is 80 + 90 = 170.

The Number of Protons in the Nucleus of an Atom