Chy102-Tutorial 06

Chy102-Tutorial 06 - General Chemistry General Chem 102 for...

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1 General Chemistry Chem. 102 for Engineering General Chemistry General Chemistry Tutorial 6
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2 16 2 6 4 7 5 8 9 11 12 13 14 15 10 18 17 1 3 B
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3 n dominates Z eff dominates
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4 Example 1 Using only the periodic table arrange the following sets of atoms and ions in order of increasing size. a) Mg, Al, Ca. b) S, Cl, S 2- c) Fe, Fe 2+ , Fe 3+ a) Compare the other atoms with Mg. Al to the right is smaller than Mg. Ca below Mg, is larger. The predicted order is Al < Mg < Ca b) Compare with S atom. Cl to the right is smaller. The S 2- anion is larger than the S atom. The predicted order is Cl < S < S 2- . c) Comparing with Fe 2+ ion; the Fe atom with no charge, is larger. The Fe 3+ ion with a 3+ is smaller. The predicted order is Fe 3+ < Fe 2+ < Fe. Answer
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5 The Ionization energy of the main group elements 1. Increases across a period from left to right in the periodic table. 2. Decreases down a group in the periodic table.
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Example 2 Consider atoms with following electron configurations 1s 2 2s 2 2p 6 1s 2 2s 2 2p 6 3s 1 1s 2 2s 2 2p 6 3s 2 Which atom has the largest first ionization energy, explain your choice. The atom with the largest value of IE 1 is 1s 2 2s 2 2p 6 (this is a neon atom). In this case, we have completely filled p subshell and it is very difficult to remove an electron from such a subshell. As for the other two configurations including 3s electrons they will be of lower IE. Answer
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This note was uploaded on 12/13/2010 for the course CHEM 102 taught by Professor Raafat during the Spring '10 term at Ain Shams University.

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Chy102-Tutorial 06 - General Chemistry General Chem 102 for...

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