november 5 th, 2015 check ionic radii ws understand ionization energy trend understand electron...
TRANSCRIPT
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November 5th, 2015
• Check Ionic Radii ws
• Understand Ionization energy trend
• Understand Electron Affinity trend
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Point of Today:
1. Understand trends:
Ionization Energy
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Ionization Energy: The amount of energy it takes to remove an
electron
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More energy required to remove electrons from smaller atoms.
(Primary factor)
Hi g
h i o
niza
t ion
Ene
r gy
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Left to Right, it takes more energy to remove electrons;
nucleus has more control.
(Secondary factor)
High Ionization Energy
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e-
e-
Low energ
y to re
move
High energ
y to re
move
Sodium - Na
Francium - Fr
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10 20 30 40
An atom with a large atomic size will have smaller ionization energy!
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High Ionization Energy
Easiest
elect
ron to re
move
Hardest
Electro
n to re
move
Hi g
h i o
niza
t ion
Ene
r gy
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Which has a larger Ionization energy…?
1. Sr or I
2. Br or Kr
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It is easy to remove the first electron from Aluminum.
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There are now more protons than electrons and the nucleus pulls those
remaining electrons tight. Therefore, it is hard to remove the next electron.
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Now the nucleus has even a stronger hold on this electron.
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It is now almost impossible to remove another electron. We have
now reached the electron configuration of a noble gas!
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First Ionization Energy
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• A metal is characterized by a low first ionization energy.
• An element with a high first ionization energy is a nonmetal.
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Assignment
• Complete Ionization energy ws we will check in 10 minutes.