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ionization - electron affinity energy change when electron...

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ionization energy  - measures amount of energy needed to lose an electron   more difficult to remove electrons w/ greater ionization energy more energy needed to remove each subsequent electron sharp increase in ionization energy needed to remove inner shell electrons o inner shell electrons much closer to nucleus I1 generally increases w/ atomic number on each row I1 decreases as atomic number increases down a group representative elements have larger range of I1 than transition elements smaller atoms tend to have higher ionization energies (electrons closer to nucleus) ion electron configurations  - electrons removed from largest available quantum number first   electrons added to lowest available quantum number first
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Unformatted text preview: electron affinity - energy change when electron is added to a gaseous atom • measures attraction of atom for added electron • usually negative (energy usually released when electron is added), but can be positive for noble gases (anion higher in energy than separated atom/electron) • halogens have the most negative electron affinities • noble gases have positive electron affinities (when adding an electron would place it on a new energy subshell) • group 5A (w/ 1/2 filled subshells) have electron affinities either positive or less negative than group 4A • doesn't change much going up/down a group...
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