University:
University of North Carolina at Charlotte
Course:
CHEM 1251 | General Chemistry I
Academic year:

2024
Views:

295

Pages:

14
Author:

Kamila P.

Chapter 1: Molecular Geometry, Intermolecular Forces, and Bonding Theories Electron Domains Valence Shell Electron Pair Repulsion (VSEPR) model: Predicts molecular geometry based on the number of valence shell electron domains around the central atom. Electron domains can be: Lone pairs Bonds (single, double, triple) Single electrons Electron domains around the central atom will be more stable when they are as far apart as possible due to electron-electron repulsion. Example: XeF4 How many electron domains are around the central atom of XeF4? Xe has 8 valence electrons. F has 7 valence electrons. Total valence electrons: 8 + (7 * 4) = 36 36 valence electrons / 2 electrons per bond = 18 electron pairs 18 electron pairs - 4 bonding pairs = 14 lone pairs 4 bonding pairs + 14 lone pairs = 18 electron domains Molecular geometry: Trigonal bipyramidal (has 5 electron domains around the atom) ELECTRON GEOMETRY W FROM EPCAL We con predict the ELECTRON-DOMAIN GEOMETRY (geomencal cazongarment of the electron domains) based on NUMBERS OF ELECTRON DOMAINS. -Imagine as balions thed together. LINEAR (2 electron domain TRIAGONAL PLANAR (3 ed.) TETRAHEDAL (ed.) TRAGONAL BIPYRAMIDAL (ed) 40 PORHEDRAL (bed) 40 molle sreupic HIREHATION = MOLECULAR ARRANGEMENT OF THE ATOMS. HOLECULAR GED HETRY • Chu and Nita both have tetrahedial electron domain geomerry, bet 30 Structure is different! LONE TETRANGEAL MG : TRIAGONAL PYRAMIDAL (that's a bar) •NO lone pairs on central atan, NORCOLAR GEOMETRY ELECTRON DOMAINN •Lone pairs on central atom. MAFCULAR GETHETRY & BETRON-DOMAIN GEOMETRY HYBRID DRBITALS 1's orbital+3partital ASP HYBRID Catal! same energy degenecated Overlaying these 4 sp³ hybrid arbitals on a comsal atem makes the TETRAHEDRAL EVESTEON GEOMETRY!