Slide Number 1Slide Number 2Slide Number 3Slide Number 4Slide Number 5Slide Number 6Slide Number 7Slide Number 8Slide Number 9Slide Number 10Slide Number 11Slide Number 12Slide Number 13Slide Number 14Slide Number 15Slide Number 16Slide Number 17Figure 1 Potential Energy Changes that Accompany Changes in the Internuclear Separation of Two Hydrogen AtomsProperties of Hydrogen Halides: polar covalent bonds, bond dipoles, electric dipole moments, µ = q x r (= charge X distance) Why??? Electric dipole moment is the product of magnitude of charges and the distance of separation between the charges. Magnitude of charges will depend on difference in electronegativity of the atoms. Now in this case, F has highest electronegativity hence HF will have highest magnitude of charges. But, as we go down the group, the atomic radii increases, hence the distance of separation (bond length) will increase. So, we would expect the two factors to balance each other. Here, it seems the difference in electro-negativity out weighs the distance (bond length) and that is why Dipole moment decreases,Two Electrons Shared between Two Atoms Make a Bond! G.N. Lewis (G. = Gilbert N. = Newton Lewis as in Lewis Structures! Lewis Structures and VSEPR: Workshop Study https://www.youtube.com/watch?v=1ZlnzyHahvo https://www.youtube.com/watch?v=xNYiB_2u8J4 Simple Review videosWhere are the electrons in Molecules? Lewis StructuresRemember the following additional things: https://www.youtube.com/watch?v=1ZlnzyHahvo https://www.youtube.com/watch?v=xNYiB_2u8J4 In TBP, lone pairs go in Equatorial positions rather Than axial positions. This minimizes repulsions.www.youtube.com/watch?v=nxebQZUVvTg http://ocw.mit.edu/courses/chemistry/5-111-principles-of-chemical-science-fall-2008/video-lectures/lecture-13/ https://www.youtube.com/watch?v=1ZlnzyHahvo https://www.youtube.com/watch?v=xNYiB_2u8J4Descriptions of geometries in mono- centric molecules: It is where The atoms are. . .VSEPR and the AXE Description of Electron