chemistry notes ( chapter 3 )
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Last updated 8:53 AM on 3/25/26
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8 Terms
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atom
the smallest particle that can have chemical characteristics of an element
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protons
carry positive charge ( +1 ) and it relative mass is 1
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neutrons
carry a neutral charge ( 0 ) and it relative mass is 1
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electrons
carry a negative charge ( -1 ) and it relative mass is 1 out of 1840
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proton number
atom is the number of protons in its nucleus
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nucleon number
total number of protons and neutrons in the nucleus
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ion
particle formed when an atom gains or loses electrons and the protons and neutrons remains the same
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isotopes
atoms of the same element that have the same proton number but different nucleon number
