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What is the mass number of an isotope that has two neutrons

User StatusQuo
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1 Answer

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16 votes

Answer:

mass number = 3

Step-by-step explanation:

Hydrogen is the only chemical species that has an isotope with 2 neutrons. Since all hydrogen atoms only have 1 proton, the mass number of hydrogen isotope with 2 nuetrons would be 3. The mass number is equal to number of protons + neutrons (+ electrons but they have virtually no mass so they can be excluded).

User Cadoo
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