Atoms and the Periodic Table Chapter 12 Pages 285 305 Review Questions 1 3 12 21 25 27 Atomic Structure Protons Neutrons Electrons Cloud Model of Atom Atomic model analogy http www sportslighting com feature ls html Analogy of atom cont http www joesentell com panther panther htm http web ics purdue edu drhodes hort410 vgsd13 htm http www skynet ie ceason cormac stuff housefly anim gif Periodic Table Atomic symbol Only first letter is capital CO is not cobalt Co Atomic Structure Protons Electrical charge 1 Equal number of negative electrons Balance to zero charge Atomic number is of protons Mass 1 atomic mass unit u Atomic Structure Neutrons Electrical charge 0 Mass 1 atomic unit Atomic Structure Nucleus Protons Neutrons Make up the NUCLEUS NEW KLEE US Nucleons have mass NEW KLEE ONS Electrons minimal mass Atomic Structure Electrons Electrical charge 1 Mass almost nothing 1 1837 of a proton Isotope notation Stable Isotope of Sodium Atomic number is protons number of nucleons is isotope Periodic Table coding Metals nonmetals and metalloids Periods and Groups Periods Groups families Inner transition metals Periodic Table Metals nonmetals and metalloids Analogy of atom cont http www joesentell com panther panther htm http web ics purdue edu drhodes hort410 vgsd13 htm http www skynet ie ceason cormac stuff housefly anim gif Shell Model of Atoms Electrons shells in periodic table First three periods Atomic Structure Protons Atomic Number Controls properties of elements Constant number for all atoms of the same element Atomic Structure Neutrons Atoms may have different numbers of neutrons Different atomic masses of atoms of the same element ISOTOPES of the same element Atomic Structure Electrons Positioned in energy shells First level 2 Second level 8 Third level 8
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