Predicting Ions and Isoelectronic - video-solutions

Predicting Ions and Isoelectronic - video-solutions - The...

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nanni (arn437) – Predicting Ions and Isoelectronic - video – CNS – (87654) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points Which monatomic ion is isoelectronic with Sr 2+ ? 1. Kr 2. Rb + correct 3. Se 2+ 4. Br + Explanation: 34 Se 2+ : [Ar] 3 d 10 4 s 2 4 p 2 35 Br + : [Ar] 3 d 10 4 s 2 4 p 4 36 Kr : [Ar] 3 d 10 4 s 2 4 p 6 38 Sr 2+ : [Ar] 3 d 10 4 s 2 4 p 6 37 Rb + : [Ar] 3 d 10 4 s 2 4 p 6 Kr, though isoelectronic with 38 Sr 2+ , is an atom, not an ion. 002 10.0 points A barium atom (Ba) would Form its most stable ion by the 1. loss oF one electron. 2. loss oF 56 electrons. 3. gain oF one electron. 4. loss oF two electrons. correct 5. gain oF two electrons. Explanation: When representative elements Form ions the atoms generally lose or gain enough electrons to become isoelectronic to the nearest noble gas. (Isoelectronic means to have the same number oF electrons.) This gives the ion a sta- ble electron confguration with a flled valence shell. The nearest noble gas to barium is xenon, which has 54 electrons.
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Unformatted text preview: The barium atom must lose two electrons to become isoeletronic with xenon. The barium ion now has 56 pro-tons and 54 electrons, giving it a net charge oF +2. 003 10.0 points A bromine atom (Br) would Form its most stable ion by the 1. gain oF 2 electrons. 2. gain oF 1 electron. correct 3. loss oF 2 electrons. 4. loss oF 1 electron. 5. loss oF 7 electrons. Explanation: When representative elements Form ions the atoms generally lose or gain enough electrons to become isoelectronic to the nearest noble gas. (Isoelectronic means to have the same number oF electrons.) This gives the ion a sta-ble electron confguration with a flled valence shell. The nearest noble gas to bromine is kryp-ton, which has 36 electrons. The bromine atom must gain one electron to become isoeletronic with krypton. The bromine ion now has 35 protons and 36 electrons, giving it a net charge oF-1....
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This note was uploaded on 09/19/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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