10/28/2019 1 Periodic Properties of the Elements Chapter 7 Periodic Classifications Periodic Classifications Free Elements Ion Formation Periodic Trends in Physical Properties
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10/28/2019
1
Periodic Properties of the Elements
Chapter 7
Periodic Classifications
Periodic Classifications Free Elements
Ion Formation Periodic Trends in Physical Properties
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Effective Nuclear Charge Effective Nuclear Charge
Effective Nuclear Charge
Effective nuclear charge experienced by a valence electron
The shielding electrons (10-) and the nucleus (11+) combine to have a 1+ effect.
Zeff Trend Atomic Radius
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Trend for Atomic Radius
Trend for Atomic Radius
INC
RE
AS
ES
DECREASES
INC
RE
AS
ES
Ionic Radius
Trend for Ionic Radius
• Follows same trend as atomic radius for same reasons
• Exception occurs when switching from cations to anions at Group 4A/14
O2- F-1 Na+1 Mg2+ Al3+
Electrons 10 10 10 10 10
Protons 8 9 11 12 13
Radius 1.26 1.19 Å 1.16 Å 0.86 Å 0.68 Å
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Ionization Energy Trend for Ionization Energy
Electron Affinity (Eea)
Electronegativity
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Reactivity
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