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OpenStudy (anonymous):
An electrically neutral atom of gallium has 31 electrons and 39 neutrons. What is the mass number for an atom of gallium? A. 31 B. 35 C. 62 D. 70
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OpenStudy (anonymous):
just add no of electrons and neutrons and you will have mass number which is D.70
OpenStudy (anonymous):
Thanks!
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