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Mass number of an elements is the sum of the number of...............and..............​
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Mass number of an elements is the sum of the number of...............and..............​

User Treetey
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protons and neutrons
User Mlbright
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Answer:

Step-by-step explanation:

The sum of the number of protons and neutrons in the nucleus is called the mass number of the isotope. The most common carbon atoms have six protons and six neutrons in their nuclei.

User Darajan
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