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Covalent Bond, Lewis Structures, Molecular Orbitals

  • Covalent bond: sharing electron pairs

  • Number of valence electrons for atom = Group number

  • Octet rule – rule of 8; 8 electrons around main group atoms in molecules except H, two electrons

  • Rules for Lewis structures: COUNT valence electrons in molecules; put 2 electrons between bonded atoms; use remaining electrons to get 8 shared by other atoms in lone pairs and/or multiple bonds

  • Exceptions to octet rule: Be, B etc. in Groups 1 and 2; third period elements like S, P, can exceed 8.

  • Electronegativity: power of atom in a bond to attract electrons

  • Electronegativity decreases down a group; increases from left to right along a period

  • Bonds can be fully ionic; polar; non-polar

  • Overlaps of atomic orbitals can give molecular orbital’s

  • Sigma orbitals: cylindrical symmetry around internuclear axis

  • Pi orbitals: plane of symmetry between nuclei

Covalent Bond, Lewis Structures, Molecular Orbitals

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

Advanced Placement Chemistry