Atoms and the Periodic Table Chapter 12 Pages 285 305 click here for 9 page to print Atoms are small Smaller than light waves Periodic table Actual arrangement doesn t fit on page very well Periodic Table Atomic symbol Only first letter is capital CO is not cobalt Co Cloud Model of Atom Atomic Structure Protons Neutrons Electrons Atomic Structure 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 Structure Neutrons El Electrical t i l charge h 0 Mass 1 atomic unit Number of neutrons is not set for an atom of an element Atomic Structure Nucleus Structure Nucleus Protons set number determines the element Neutrons no set number can be different for same element Make up the NUCLEUS NEW KLEE US N l Nucleons have h mass NEW KLEE ONS Atomic Structure Structure Electrons Electrical charge 1 Mass almost nothing 1 1837 of a proton 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 coding g Metals metalloids and nonmetals aaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaa Periods and Groups Atomic size across periods Groups families Name N groups 13 13 16 16 b by element l t att h head d Electron waves Certain energy and location function of wavelength right diagram is not sustainable Shell Model of Atoms Electrons shells in periodic table First three periods Atomic Structure Electrons Structure Electrons Modeled in energy shells First shell 2 electrons Second shell 8 electrons Third shell 8 electrons Analogy of atom atom cont 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 e od c Table ab e Metals nonmetals and metalloids Inner transition metals Atomic Structure Atomic Number number of protons p Controls properties of elements Constant number for all atoms of the same element Atoms of the same substance may have different numbers b off neutrons t ISOTOPES of the same element described by mass number Atomic mass of element is average mass of isotopes that occur in nature Electrons have negligible mass and are present in a cloud surrounding g the nucleus modeled with shells but actually random locations
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