Biology / Bio 0113 · Atom · ~20 seconds
Atomic Structure
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An atom has a nucleus of protons and neutrons at its center, surrounded by electrons occupying the space around it.
Show
A proton carries a positive charge, a neutron none, and an electron a negative charge equal and opposite to a proton's.
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Nearly all of an atom's volume is empty space around the nucleus — mass is not spread evenly through it.