Problem: What is the mass number of an ion with 109 electrons, 159 neutrons, and a +1 charge?

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We’re being asked to determine the mass number of an ion with 109 electrons, 158 neutrons, and a +1 charge.


Mass number is the sum of protons and neutrons in a nucleus

Mass number = # of protons + # of neutrons


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What is the mass number of an ion with 109 electrons, 159 neutrons, and a +1 charge?

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