CHEM 105N 1st Edition Lecture 12 Outline of Last Lecture I. Atomic MassII. Electromagnetic RadiationIII. Nature of Light- Electromagnetic Spectrum- Spectra- Atomic SpectrumIV. Electron Energy Levels- SublevelsV. Orbitals- DiagramsOutline of Current Lecture I. FillingII. Orbital DiagramsIII. Electron Configuration:IV. Abbreviated Configurations:Current LectureI. Filling:-Energy Levels (s, p, d, f) are filled with electrons -in order of increasing energy- beginning with quantum number n=1Order: 1s2s2p3s3p3d4p5s4d5p6s4f5d6p7s5f6d7pII. Orbital Diagrams:- Shows orbitals as boxes in each sublevel- Electrons in orbitals as vertical arrows- Electrons in same orbitals with opposite spins (up and down arrows)- Fill lowest energy level Ex.He (2ē) 1s- Fill lowest energy level and orbitals firstThese 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.- Up arrows always go first- Fill all orbital boxes with up arrows before beginning with down arrowsIII. Electron Configuration:-Lists the filled and partially filled energy levels in order of increasing energy.-Uses superscripts to show the number of electrons in each sublevel.Ex.AL (13ē) 1s 2s 2p 3s 3pElectron Configuration= 1s^2, 2s^2, 2p^6, 3s^2, 3p^1IV. Abbreviated Configurations:- Short-hand version of electron configurations- Simply find the noble gas preceding that which you wish to write the configuration- Put noble gas in brackets and list the remaining orbitalsEx.Chlorine has the following configuration: Cl: 1s2 2s2 2p6 3s2 3p5 (bold= filled)Ne: 1s2 2s2 2p6The abbreviated configuration for chlorine is [Ne]3s2
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