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Atomic Structure Element: An element is a __________ substance that is made from a single type of atom. Atom: The basic building block of matter, made up of sub atomic particles. (p+) - ____________ charged particles in the Protons nucleus Neutrons (n) nucleus Electrons (e-) _______________ charged particles ‘orbiting’ the nucleus particles with ____________in the Each element in the periodic table has two important numbers. Smaller value ______________ Corresponds to the position on the P.T Larger Value _____________ of the atom Atomic number = _______________. There are the __________ number of electrons as protons _________________________ = Atomic Mass(rounded) – Atomic # EX. Mg Atomic # = 12 Atomic Mass = 24.3 Protons = ________ Electrons = _________ Neutrons = _________ Bohr Model Named after Niels Bohr (1885 – 1962) Represented an atom as a central ‘nucleus’ with electrons orbiting around it in different shells or ________________________ o 1st orbit holds a maximum of _____ electrons o 2nd orbit holds a maximum of _____ electrons o 3rd orbit holds a maximum of _____ electrons The _________________________ is that outermost shell (orbit) that contains electrons Valence electrons are found in the valence shell and can be _________________. A atom is stable if all shells are ________________. __________________: Not easily decomposed or otherwise modified chemically. They are happy just the way they are! Lewis Dot Diagrams A shorthand model that describes an atom and its ______________________. The symbol for the element replaces the nucleus and the inner full shell(s) of electrons. The __________________________ (outermost shell) are represented by dots (●) Ex. Al