CHMY 121 1st Edition Lecture 14Review- Electron cloudo The best we can do with electrons is define an area where we might find an electron- Electron Orbitalso Regions of probability have distinct shapes  Called orbitals and they have the same letter symbols as subshellso Orbitals increase size as n increaseso Orbitals can overlap in space- Chemical bondso Ionic Transfer of electrons/change attractiono Covalent Shared electrons and have a full octeto Both types involve interaction of valence electrons- Valence ElectronsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o Groups each have their own set number of VE and can make a certain number of bonds Ex Group 6 has 6 VE and can make 2 bonds- Drawing Covalento Dot diagrams or Lewis dot structures- 4 steps to Lewis structureso Count number of VEo Connect Atomso Fill remaining VEo If atoms do not have full octet trade pair of electrons for bonds Single-2 Double-4 Triple-6- You tryo PCL3o H2CO- Polyatomic Ionso Molecules that carry a charge Small charged electronso Additional electrons are requiredo Take charges into account + charge=subtract VE - charge=add VE- Chemical Bondingo Pure Covalent  Equal attraction, shared equalityo Polar Covalent Electrons prefer one atom, unequally sharedo Ionic Electrons taken by more electronegative atom, atoms become charged- Naming Ionic Compoundso First word is the cation and the second is the anion which takes the suffix of “ide” NaCL Sodium Chloride LiF Lithium Florideo Name says nothing about number of atomso Charges on ions formed by the elements allows us to figure out the formula- Naming Polyatomic Ionso Several common ions are polyatomic ions Table will be provided on testo List similar to the one on the righto Examples Potassium Nitrate Sodium Phosphate- Naming Transition Metalso Must use roman numeralso FeO and Fe+2 and O-2 are all named Iron(II) OxideAnnouncements-Homework 4 is due Monday Feb. 23rd by 11pm-Next exam is Tuesday March