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Structure of the Atom

ElectronNegatively Charged
ProtonPositively Charged
Number of ProtonsAtomic Number
Number of Protons + Number of NeutronsMass Number
NucleusCore of the Atom
Smallest known elementary particles of matterQuarks
Same number of protons and different number of neutronsIsotopes
Opposite ChargesAttract
Like ChargesRepel
AtomElectrically Neutral

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