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Definition of mass number​
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Definition of mass number​

User Ismael
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3 votes

Answer:

The total number of protons and neutrons in a nucleus.

Step-by-step explanation:

I memorized it.

User Lante Dellarovere
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3 votes

Answer:

Mass number of an atom is defined as the sum of the number of protons and number of neutrons.

User Jay Bharat
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