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Science
Chemistry
Atomic Structure
One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?
4
7
11
18
1 answer
The mass number of an isotope is equal to the sum of protons and neutrons in its nucleus. In this case, the isotope of sodium has 11 protons and 7 neutrons, so the mass number is 11 + 7 = 18. Therefore, the correct answer is 18.
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