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Ch.8 - Periodic Properties of the ElementsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Sections
The Electron Configuration
The Electron Configuration: Condensed
The Electron Configurations: Exceptions
The Electron Configuration: Ions
Paramagnetism and Diamagnetism
The Electron Configuration: Quantum Numbers
Valence Electrons of Elements
Periodic Trend: Metallic Character
Periodic Trend: Atomic Radius
Periodic Trend: Ionic Radius
Periodic Trend: Ionization Energy
Periodic Trend: Successive Ionization Energies
Periodic Trend: Electron Affinity
Periodic Trend: Electronegativity
Periodic Trend: Effective Nuclear Charge
Periodic Trend: Cumulative
Additional Guides
Atomic Radius (IGNORE)
Ionization Energy (IGNORE)

Electron Affinity is the energy released from the addition of an electron to a gaseous atom or ion. 

Electron Affinity

Concept #1: Periodic Trend: Electron Affinity

Concept #2: Periodic Trend

Generally, electron affinity increases moving from left to right across a period and going up a group.

Example #1: Which of the following halogens will have the most exothermic electron affinity?

Concept #3: Exceptions to Electron Affinity

Practice: Which of the following represents the third electron affinity of Si?

Practice: Determine which atom in the following set has the most exothermic electron affinity: N, O, C, B, Ne

Practice: Rank the following elements in order of increasing electron affinity: Cs, Hg, F, S