5-Pauli Exclusion Principle (Wolfgang Pauli, Austria, 1900-1958) -Electron Spin Quantum Number An orbital can hold only two electrons and they must have opposite spin.Electron Spin Quantum Number (ms):+1/2, -1/2
6Hund’s RuleIn a set of orbitals, the electrons will fill the orbitals in a way that would give the maximum number of parallel spins (maximum number of unpaired electrons).Analogy: Students could fill each seat of a school bus, one person at a time, before doubling up.
15Standard Notation of Fluorine Number of electronsin the sub level 2,2,51s2 2s2 2p5Main Energy Level Numbers 1, 2, 2Sublevels
16Shorthand NotationUse the last noble gas that is located in the periodic table right before the element.Write the symbol of the noble gas in brackets.Write the remaining configuration after the brackets.Ex: Fluorine: [He] 2s2 2p5
20Electron Configuration Group Activity Inquiry activity … meaning little help from Mr. D … I may guide you a bitSomething to do with building a model electron configurations???Groups of 4Faciliatator – Keeps group on task, makes sure that everyone is doing their job and helps out where needed, gets element card from Mr. D. Check with Mr. D. when you feel your group needs guidance.Materials Manager- Gets materials from white box, you can only use these materials! If you want to use other materials, check with Mr. D.Engineer – You will actually build the model that group suggests … you are the hands-on person.Reporter – You will explain model to Mr. D. and answer any questions that he has. Other group members will be asked questions as well and need to be prepared.