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Modern Atomic Theory Notes Present-Day model of the atom After many scientists, it has been established that electrons act like both ___________________ and ___________________. Like light waves, electrons can change direction through ______________________. ____________________ is the bending of a wave as the wave passes by the edge of an object. _________________________, like waves, can interfere with each other. The modern model of the atom takes into account both the _____________________ and _____________________ properties of electrons. According to this model, electrons are located in ___________________, regions around a nucleus that correspond to specific energy levels. ___________________ are regions where electrons are likely to be found. Orbitals are sometimes called ____________________________________ because they do not have sharp boundaries. The Structure of an Atom Notes Atoms have 3 subatomic particles: • ________________________ • ________________________ • ________________________ Particle Relative Mass Charge Location (amu stands for _____________ ____________________) Atomic number = Since atoms are neutral: The mass number of an atom is: To find the mass number on the periodic table, round the atomic mass to the nearest whole number. To find the # neutrons: # neutrons = Atomic # Mass # Carbon 6 12 Sulfur 16 32 # protons # electrons # neutrons Isotopes Not all atoms of a particular element have the same # of _____________________, but they have the same atomic number (same # of ______________________). These are called _________________________________. Three main isotopes of carbon: Isotope # protons # neutrons Mass Number = ________ Atomic Number = ________