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Periodic Table & Electrons

Periodic Table & Electrons. Valence Electrons – electrons that are in the highest energy level of an atom. Example: Silicon 1s 2 2s 2 2p 6 3s 2 3p 2 4 valence electrons…. Periodic Table & Electrons. Representative elements (groups 1, 2, 13-18)

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Periodic Table & Electrons

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  1. Periodic Table & Electrons • Valence Electrons – electrons that are in the highest energy level of an atom. • Example: Silicon • 1s22s2 2p6 3s2 3p2 • 4 valence electrons…

  2. Periodic Table & Electrons • Representative elements (groups 1, 2, 13-18) • Valence electrons = last number in the group number. • Silicon Group 14 = 4 valence e- ! [http://academic.reed.edu/chemistry/roco/Lewis/images/periodic.gif]

  3. Periodic Table & Electrons • Noble gases have 8 valence electrons. • This property makes them inert, or unreactive. Neon = 1s22s22p6

  4. Periodic Table & Electrons • Other atoms form ions so that they have 8 electrons in the highest level. [http://home.att.net/~cat6a/images/form_Na_ion.jpg]

  5. [http://www.chemprofessor.com/ptable4.gif]

  6. Ionization Energy • The energy needed to remove an electron from an atom. [http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/images/ionization-energy.jpg]

  7. [http://www.chemistry.ohio-state.edu/~grandinetti/teaching/Chem121/lectures/periodic%20trends/ionization_table.JPG][http://www.chemistry.ohio-state.edu/~grandinetti/teaching/Chem121/lectures/periodic%20trends/ionization_table.JPG]

  8. Ionization Energy • There are also 2nd Ionization Energies (remove 2nd electron) and 3rd Ionization Energies (remove 3rd electron). • Pg. 180

  9. Electronegativity • The measurement of how much an atom “attracts” extra electrons.

  10. Atomic Radius • Distance from the center of an atom to the outermost electron. • Ba, Ca, Sr [http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter05/Text_Images/FG05_20-07UN.JPG]

  11. [http://images.encarta.msn.com/xrefmedia/aencmed/targets/illus/ilt/1e67a7ad.gif][http://images.encarta.msn.com/xrefmedia/aencmed/targets/illus/ilt/1e67a7ad.gif]

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