CH1440Ch7 - Periodic Trends In this chapter, we will...

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Periodic Trends • In this chapter, we will rationalize observed trends in – Sizes of atoms and ions. – Ionization energy. – Electron affinity.
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Effective Nuclear Charge • In a many-electron atom, electrons are both attracted to the nucleus and repelled by other electrons. • The nuclear charge that an electron experiences depends on both factors.
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Effective Nuclear Charge The effective nuclear charge, Z eff , is found this way: Z eff = Z S where Z is the atomic number and S is a screening constant, usually close to the number of inner electrons.
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Sizes of Atoms Bonding atomic radius tends to… …decrease from left to right across a row due to increasing Z eff . …increase from top to bottom of a column due to increasing value of n
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Sizes of Ions • Ionic size depends upon: – Nuclear charge. – Number of electrons. – Orbitals in which electrons reside.
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• Cations are smaller than their parent atoms. – The outermost
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This note was uploaded on 08/22/2010 for the course CHS 1440 taught by Professor Staff during the Spring '06 term at University of Central Florida.

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CH1440Ch7 - Periodic Trends In this chapter, we will...

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