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Lewis Dot Diagrams

Lewis Dot Diagrams. Each row of the periodic table is called a period All elements in a period have the same number of atomic orbitals (or shells) Each column of the periodic table is called a group or family All elements in a group have the same number of valence electrons.

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Lewis Dot Diagrams

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  1. Lewis Dot Diagrams

  2. Each row of the periodic table is called a period • All elements in a period have the same number of atomic orbitals (or shells) • Each column of the periodic table is called a group or family • All elements in a group have the same number of valence electrons

  3. Bohr Diagram Review • Draw the Bohr diagram for the following: Oxygen, Fluorine, Sodium

  4. Lewis Dot Diagrams • Method of representing atoms • Discovered by Gilbert N. Lewis • In a dot diagram, only the symbol for the element and the electrons in its outermost energy level (valence electrons) are shown • Eg: Sodium has 1 valence e- in it’s outermost shell, the diagram for sodium would look like this Na

  5. Drawing Lewis Dot diagrams in 3 easy steps Getting Started: 1. Find your element on the periodic table. 2. Determine the number of valence electrons. -this will be determined by which group your element is in (eg: Li is in group 1, so it has 1 valence electrons) 3. This is how many electrons you will draw.

  6. Lone pair – electrons in atom’s valence shell (not used in bonding) ex: Na • Bonding pair – electron pair involved in bonding ex: N

  7. Example 1 - Carbon • Write the symbol for the element. • How many valence electrons does it have? • Start on the top and draw the electrons clockwise or counter-clockwise around the element . • Check your work— did you draw the correct number of electrons? C

  8. Example 2 - Chlorine Cl

  9. Your Turn • Draw Lewis diagrams for the following: Magnesium, Neon and Boron

  10. Mg Ne B

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