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First ionization energy

First ionization energy - Important exceptions at...

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First ionization energy (IE 1 ) The minimum amount of energy required to remove the most loosely bound electron from an isolated gaseous atom to form a 1+ ion. Second ionization energy (IE 2 ) The amount of energy required to remove the second electron from a gaseous 1+ ion. Periodic trends for Ionization Energy : 1. IE 2 > IE 1 It always takes more energy to remove a second electron from an ion than from a neutral atom. 1. IE 1 generally increases moving from IA elements to VIIIA elements.
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Unformatted text preview: Important exceptions at Be & Mg, N & P, etc. Why? 1. IE 1 generally decreases moving down a family. IE 1 for Li > IE 1 for Na, etc. 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 completed electron shell....
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