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October 31, 2014

Homework Help: US History

Posted by mysterychicken on Friday, October 22, 2010 at 3:52pm.

41. A neutron atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons, and electrons.

This is what I got-
Protons: 19
Neutrons: 20
Electrons: ?

Thanks
-MC

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