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OpenStudy (brebredoecx):
Beryllium is an element with atomic number 4 and mass number 9. How many protons are in this isotope? A. 0 protons B. 4 protons C. 5 protons D. 9 protons
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OpenStudy (sapphiremoon):
B. 4 protons. An atom always has the same number of protons as its atomic number (that's the definition of atomic number).
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