Pt40 Propsdefined Reg
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Transcript of Pt40 Propsdefined Reg
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Shielding Effect
Kernel electrons block the attractive force of the nucleus from the valence electrons
+nucleus
Valence
Electrons--
- -
Electron
Shield“kernel”
electrons
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http://www.bcpl.net/~kdrews/properties/properties.html#Atomic
ATOMIC RADIUS
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Periodic Trends in Atomic Radii
LeMay Jr, Beall, Robblee, Brower, Chemistry Connections to Our Changing World , 1996, page 175
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ELECTRONEGATIVITY—a measure of how strongly an atom’s nucleus pulls electron density toward itself when in a bond.
*assigned (Pauling scale)
*only useful in comparing two atoms (MEANS THAT ALL YOU CARE ABOUT IS THE DIFFERENCE!!!!)
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Which has greater electronegativity in each compound?
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IONIZATION ENERGY—a measure of how strongly an atom hold onto its electrons
*Ionization—removal of electrons1st: Atom A +I1 Ion A+ + free e-2nd: Ion A+ + I2 Ion A+2 + free e-
• It REQUIRES you to put in energy (excite the electron until it pops off)
• the more tightly an electron is held, the more energy is required