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Q: A common isotope of carbon has a mass number of 13. The total number of protons and neutrons in the nucleus is - A. 19. B. 13. C. 12. D. 6.
A: The mass number, often represented by the symbol A, is the total number of neutrons and protons in the nucleus of an atom.
ghelee|Points 194|
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Asked 7/11/2012 11:58:28 AM
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Which element above has 8 protons in its nucleus? A. oxygen B. carbon C. phosphorus D. sulfur
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Updated 107 days ago|10/2/2017 12:10:57 PM
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Oxygen has 8 protons in its nucleus.

Added 107 days ago|10/2/2017 12:10:53 PM
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