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MSU CHMY 121IN - Bohr's Model/Theory

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Chmy 121in 1st Edition Lecture 12Current LectureReview- Bohr’s model/Theoryo In Bohr’s model, electrons orbit the nucleus like planets around the suno Electrons furthest from the nucleus have the most energy most unstable most likely to react- Orbitalso Electron shells  Shells are assigned principle quantum numbers (n=1,2,3…)  Each shell has a different number of electrons it can hold, equal to 2n2o Electrons generally occupy the lowest shell available AKA ground state- Concept Checko T or F? Orbitals occupy more space as n increases o If n increases and the size increases, how do you expect this to affect the number of electrons a shell can hold?  Each shell can hold 2n2 electronsToday’s Lecture- Energy Shellso • As you move away from the nucleus, the energy differences between levels is less –  Energy level diagrams Shells do not become physically closer- Bohrs Model Predicts Hydrogen Spectrao To determine ground state, put electrons in the lowest energy shells This is the ground state electron configurationo Electron can be excited to higher energy excited stateso Electron can relax to any lower energy shell o Difference between shells determines energy Energy defines color of light- Relaxationo Energy is released during relaxationThese 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. Either light or heat The amount of energy released determines the wavelength (l) of light and therefore the color- Sub shellso • Each shell contains subshellso The number of subshellsdepends on the number ofelectrons in shell –  n = 1 has only s  n = 2 has s and p n = 3 has s, p and d n = 4 has s, p, d, and f- Electron Configurationo We have a short hand notationfor showing how electrons arearranged in an atom. It is calledthe atom’s electronconfigurationo Arsenic Configurationo ---- Hunds Rule- Octet Ruleo Elements react in such way as to place 8 Electrons In their outermost shello Exceptions H, He(2), Be(4),B(6) Some 3rd period elements have more then 8 Group 4 don’t behave Transition metals don’t really follow the rule- Cheat Cheat Electron Configurations- Summary of Groupso IonsAnnouncements- Homework 3 is open and is due Monday Feb. 16 at 11 pm- Exam Scores are posted to D2L- Next Exam March


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MSU CHMY 121IN - Bohr's Model/Theory

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