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Structure of the atom Protons • Have Positive (+) charge • Found in Nucleus of atom • Same mass as neutron Neutrons • Have no charge (Zero) • Found in Nucleus of atom • Same mass as proton Electrons • Have a negative charge (-) • Found outside nucleus • Have very small mass (almost can ignore) Subatomic Particles Atom Protons Neutrons Electrons Particle Symbol Charge Mass Electron e- -1 1/1836 Proton p+ +1 1 Neutron n 0 1 Atomic Number • Atomic number = number of protons – For neutral atom = number of electrons • Atoms of different elements have different Atomic numbers (number of protons) – At # Hydrogen = 1 – At. # Carbon = 6 Mass number • Mass number = protons + Neutrons (p+n) – Electron mass too small (ignored) • # Neutrons = Mass # – Atomic #