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Chemistry 9 Online
OpenStudy (anonymous):

If a neutral atom of boron (B) contains 5 protons, 5 electrons and 6 neutrons, what is the mass number of this atom? a 21 b 11 c 10 d 5

OpenStudy (anonymous):

The correct answer is B.

OpenStudy (anonymous):

@carsonsi thank you doll !!

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