Electron Domains and Molecular Shape

Our lesson today combines textbook lesson 37 (electron domains) and lesson 38 (molecule shape).  We will work through the PowerPoint and students will concurrently take notes on the Handout for this lesson while also building molecules with molecular modeling kits.  Students will then complete the Lesson 38 Worksheet.

Key ideas:

  • noble gases (single atoms) are visualized as points
  • molecules consisting of two atoms (i.e. hydrogen fluoride) are linear
  • molecules consisting of three atoms can be bent (H2O) or linear (CO2)
  • molecules consisting of four atoms, like ammonia (NH3) are called pyramidal
  • molecules consisting of five atoms, like methane (CH4) are called tetrahedral
  • larger molecules consist of multiple shapes put together


  • Read Lessons 37 and 38 in the textbook.  Login via hs.saplinglearning.com and enter your username and password.
  • Write notes for Lessons 37 and 38 and work through the practice problems at the end of Lessons 37 and 38.
  • Please ask questions about anything from Lessons 37 and 38 you do not yet fully understand.

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