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1 
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the smallest unit of an element that still has the properties of that element 
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2 
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located inside the nucleus, this subatomic particle has a positive electric charge 
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3 
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located inside the nucleus, this subatomic particle as no electric charge 
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4 
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situated on the outskirts of the nucleus, this subatomic particle has a negative charge 
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1 
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the number of protons in an atom  
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5 
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comprised of protons and neutrons, this is the core, or center, of an atom 
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