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Electron Arrangements

Electron Arrangements. Lewis Dot Structures. Learning Objectives Express the arrangement of electrons in atoms using Lewis valence electron dot structures. Electron Arrangements. Valence electron – an electron in an atom’s highest occupied energy level

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Electron Arrangements

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  1. Electron Arrangements Lewis Dot Structures

  2. Learning Objectives • Express the arrangement of electrons in atoms using Lewis valence electron dot structures • Electron Arrangements

  3. Valence electron – an electron in an atom’s highest occupied energy level • Outermost electrons of the electron cloud • Establish chemical characteristics of elements • Only electrons shown in Lewis electron dot structures • Symbolized as dots • Lewis Dot Structures

  4. Number of valence electrons is the same as the group number for representative elements • Lewis Dot Structures

  5. Helium is an exceptionbecause its highest occupied energy level can only hold two electrons • Lewis Dot Structures

  6. Number of valence electrons determines behavior • Elements in the same group have similar chemical properties • Lewis Dot Structures

  7. Drawing an Electron Dot Structure Step 1 Step 2 • Identify the symbol for the element and its number of valence electrons using the periodic table. • Place the corresponding number of electron dots around the symbol. Imagine that the symbol has four sides: top, right, bottom, and left. Begin by assigning one dot per side, moving clockwise around the symbol. Then, if there are still more dots to assign, start adding a second dot to each side until all of the valence electrons have been accounted for.

  8. Drawing an Electron Dot Structure Step 1 Step 2 Does the result make sense? Ex) Draw the electron dot structure for phosphorus. • Identify the symbol for the element and its number of valence electrons using the periodic table. • The symbol for phosphorus is P. Phosphorus is in group 5A so it has 5 valence electrons. • Place the corresponding number of electron dots around the symbol. Imagine that the symbol has four sides: top, right, bottom, and left. Begin by assigning one dot per side, moving clockwise around the symbol. Then, if there are still more dots to assign, start adding a second dot to each side until all of the valence electrons have been accounted for. Yes.

  9. Learning Objectives • Express the arrangement of electrons in atoms using Lewis valence electron dot structures • Electron Arrangements

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