Protons, neutrons, and electrons
Both protons and neutrons have a mass of 1 amu and are found in the nucleus. However, protons have a charge of +1, and neutrons are uncharged. Electrons have a mass of approximately 0 amu, orbit the nucleus, and have a charge of -1.
Source
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"OpenStax College, Biology. October 30, 2013."
http://cnx.org/content/m44390/latest/?collection=col11448/latest
OpenStax CNX
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