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Biology 22 Online
OpenStudy (anonymous):

Please help me, I will medal and fan!

OpenStudy (anonymous):

The mass number of an atom is 10. It has 4 protons, 4 electrons and 2 neutrons. 10 protons. 10 neutrons. 5 neutrons and 5 protons

OpenStudy (aaronq):

the mass number is the sum of the atomic number (# of protons) and the number of neutrons

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