Tue 10_12_10 Chapter 5

Tue 10_12_10 Chapter 5 - 2. Ionization Energy Example 5-4:...

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2. Ionization Energy Example 5-4: Arrange these elements based on their first ionization energies (smallest to largest) their first ionization energies (smallest to largest). – Sr, Be, Ca, Mg You do it! 29 Sr < Ca < Mg < Be 2. Ionization Energy Example 5-5: Arrange these elements based on their first ionization energies (smallest to largest) their first ionization energies (smallest to largest). – Al, Cl, Na, P You do it! 30 Na < Al < P < Cl
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2. Ionization Energy Example 5-6: Arrange these elements based on their first ionization energies (smallest to largest) their first ionization energies (smallest to largest). – B, O, Be, N You do it! 31 B < Be < O < N 2. Ionization Energy • First, second, third, etc. ionization energies exhibit periodicity as well. • Look at the following table of ionization energies versus third row elements. – Notice that the energy increases enormously when an electron is removed from a 32 completed electron shell.
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2. Ionization Energy Group and IA IIA IIIA IVA and element Na Mg Al Si IE 1 (kJ/mol) 496 738 578 786 IE 2 (kJ/mol 4562 1451 1817 1577 33 (kJ/mol) IE 3 (kJ/mol) 6912 7733 2745 3232 IE 4 (kJ/mol) 9540 10,550 11,580 4356 2. Ionization Energy • The reason Na forms Na + and not Na 2+ is that the energy difference between IE and that the energy difference between IE 1 and IE 2 is so large. – Requires more than 9 times more energy to remove the second electron than the first one. • The same trend is persistent throughout the series 34 the series. – Thus Mg forms Mg 2+ and not Mg 3+ . – Al forms Al 3+ .
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2. Ionization Energy Example 5-7: What charge ion would be expected for an element that has these ionization energies? You do it! IE 1 (kJ/mol) 1680 IE 2 (kJ/mol) 3370 IE 3 (kJ/mol) 6050 IE (kJ/mol 8410 The first big jump in IE is between removal of the 7 th and 8 th electron. No element is going to loose 7 electrons (too much Energy 35 IE 4 (kJ/mol) IE 5 (kJ/mol) 11020 IE 6 (kJ/mol) 15160 IE 7 (kJ/mol) 17870 IE 8 (kJ/mol) 92040 required)!!
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This note was uploaded on 10/28/2010 for the course CHEM 1211 taught by Professor Bro during the Spring '10 term at Université de Genève.

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Tue 10_12_10 Chapter 5 - 2. Ionization Energy Example 5-4:...

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