CHEM 102 Lecture Notes - Lecture 7: Vsepr Theory, Octet Rule, Electronegativity
Document Summary
Chem102 - lecture 7 - lewis structures and resonance structures. The le model illustrates covalent bonds between electrons in an atom. The model also demonstrates that a molecule have atoms that share electron pairs via their atomic orbitals. Lone pairs are considered to be localized on an atom and are not bonded. Bonding pairs in the le model are placed in between atoms. The le model focuses on three concepts: lewis structures, vsepr model and. Lewis structures are illustrations that model how valence electrons are arranged within a molecule. Hydrogen atoms are always on the ends of a molecule (terminal) Carbon atoms are always in the middle of a molecule (central) Generally, central atoms have the lowest electronegativity (difference in polarity) While most elements obey the octet rule, hydrogen and helium obey the duet rule. Hydrogen and helium can only share two electrons in order to be stable. Most elements obey the octet rule, must share only eight electrons.