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Name: Date: Period: Page # Evolution of Atomic Theory (Changed over time as new discoveries were made) Atomic Theory Ancient Greeks were the first to think about the nature of _____________ Democritus proposed the idea of matter as small ____________ _________: the smallest particle of an element As more evidence was collected over time, the theory and models were ________ _______________________: atoms were like smooth, hard spheres that could not be ____________ into smaller pieces All ____________ are composed of ___________ that cannot be divided Atoms cannot be ____________ or _____________ in a chemical change __________________ are composed of more than one ______________ ______________ found smaller parts of atoms--atoms contain ______________ charged particles (_______________)e Berries in a muffin _______________ and the Nucleus: ________ __________ Experiment A few particles ______________ strongly Some bounced ________!! ______________ (no charge): located in ___________ of atom ____________ (+): positively charged particles ___________ the nucleus ____________ ___________: showed electrons could only have specific amounts of __________, leading them to move in certain __________ ____________ __________ Model: According to this model, the ____________ move _____________ in every direction around the nucleus Page # The Modern Atomic Model The Modern Atomic Model: ______________ Discovered Neutron= same ___________ as proton Describes an atom as consisting of a nucleus that contains ___________ and neutrons ________________ by electrons Particle Charges: Protons charge is_____ Electrons charge is ______ # of protons = # of electrons making the atom ___________ # of _____________ does not always match #of P+ and e- because they have no charge Comparing Particle Mass: atomic mass unit= amu (1 proton is _____ _____) Protons and neutrons make up nearly the entire _______ of the atom Scale and Size of Atoms The tiniest visible speck of ______ may contain 10 million billion ______ Atomic Number # of ___________ in the nucleus of an atom Identifies an ___________ Isotopes and Mass Number Isotopes: different number of _____________ Mass number: sum of ____________ and _____________ Model of an Atom