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What is the mass number of an atom or ion with one proton, two neutrons, and one electron?
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3 votes
What is the mass number of an atom or ion with one proton, two neutrons, and one electron?

User Harish Lalwani
by
7.9k points

1 Answer

1 vote

Answer:

3

Step-by-step explanation:

mass no.=protons+neutrons

mass no.=1+2=3

User Halirutan
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7.9k points
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