Recording-2025-03-25T18:02:03.050Z

Introduction to Electron Dot Structures

• Focus on the arrangement of atoms and their associated electron clouds.

Iodine as Central Atom

• Iodine is chosen as the central atom in the discussed structure.

• Total of five charge clouds:

  • Axial positions: 2

  • Equatorial positions: 3

• Three lone pairs on the iodine atom.

• Placement of Lone Pairs:

  • All three lone pairs occupy the equatorial positions to minimize repulsion.

• Physical Arrangement:

  • The axial positions are occupied by iodine atoms.

• Bond Angle:

  • Starting angle is 180° for the axial atoms, referring to the geometric arrangement around the iodine.

Example of Six Charge Clouds

• Transition to six charge clouds model using sulfur hexafluoride (SF6).

• Structure:

  • All atoms are equivalent positions, forming a square planar arrangement.

  • One atom is positioned above and one below the square plane.

• Bond Angles:

  • The angles between adjacent fluorine atoms is 90°.

Antimony Structure

• Examines antimony (Sb) bonded to five chlorine (Cl) atoms with one lone pair.

• Lone Pair Positioning:

  • The lone pair can be placed in any position since all positions are equivalent.

• Bond Angles Around Lone Pair:

  • When adjacent to lone pairs, two specific angles are:

    • Between chlorines: 90° and 80° depending on positions.

Naming Conventions in Chemistry

• Importance of using all components of a molecular name.

• Both identities