Unit II_ Coordination Chemistry Practice.pdf - 19.1:...

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19.1: Occurrence, Preparation, and Properties of Transition Metals and Their Compounds(Q19.1.1)QuestionWrite the electron configurations for each of the following elements:a. Scb. Tic. Crd. Fee. RuWrite the electron configurations for each of the following elements:(a)(b) Ti(c) Cr(d) Fe(e) RuPreview My AnswersSubmit AnswersWeBWorK2122152617
e. Ru: [Kr]5s4d(anomalous configuration)
The periodic table is broken up into groups which we can use to determine orbitals and thus, write electron configurations:Group 1 & 2: S orbitalGroup 13 - 18: P orbitalGroup 3 - 12: D orbitalLanthanide & Actinides: F orbitalEach orbital (s, p, d, f) has a maximum number of electrons it can hold. An easy way to remember the electron maximum ofeach is to look at the periodic table and count the number of periods in each collection of groups.Group 1 & 2: 2 (2 electrons total = 1 orbital x max of 2 electrons = 2 electrons)Group 13 - 18: 6 (6 electrons total = 3 orbitals x 2 electrons max = 6 electrons)Group 3 - 12: 10 (10 electrons total = 5 orbitals x 2 electrons max = 10 electrons)Lanthanide & Actinides: 14 (14 electrons total = 7 orbitals x 2 electrons max = 14 electrons)Electron fills the orbitals in a specific pattern that affects the order in which the long-hand versions are written:Electron filling pattern:1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5fAn easier and faster way to write electron configurations is to use noble gas configurations as short-cuts. We are able to do thisbecause the electron configurations of the noble gases always have all filled orbitals.He: 1s2sNe: 1s2s 2pAr: 1s2s 2p 3s 3pKr: 1s2s 2p 3s 3p 4s 3d4pXe: 1s2s 2p 3s 3p 4s 3d4p 5s 4d5pRn: 1s2s 2p 3s 3p 4s 3d4p 5s 4d5p 6s 4f5d6pThe most common noble gas configuration used is Ar. When you want to use the noble gas configuration short-cut, youplace the noble gas's symbol inside of brackets: [Ar]and then write it preceding the rest of the configuration, which is solely the orbitals the proceed after that of the noblegas.Solution aScLet's start off by identifying where Scandium sits on the periodic table: row 4, group 3. This identification is the critical basiswe need to write its electron configuration.

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NH3, Coordination Chemistry of Transition Metals

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