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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? 31 62 35 70
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OpenStudy (photon336):
Mass number = protons+neutrons.
OpenStudy (photon336):
Electrically neutral means number of protons = number of neutrons.
OpenStudy (photon336):
So 31+39= 70 is your mass number
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