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Masses of Atoms Atomic Mass •The mass of the protons and neutrons (electrons have almost NO mass) • Atomic mass = mass # Atomic Number •# of protons in an atom • The atomic # is the identity of an element • Like a fingerprint for a human being *If you need to find the number of neutrons in an atom: • # neutrons= mass # - atomic # Isotopes • Atoms of the same element that have different numbers of neutrons • Boron-10 ; Boron-11 • Different isotopes have different properties Average Atomic Mass • Weighted average of an element’s isotopes Practice Isotope name Potassium-37 Oxygen-17 uranium-235 uranium-238 boron-10 boron-11 atomic # mass # # of protons # of neutrons # of electrons
