Periodic Behavior

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Definition: A measure of the ability of an atom in a chemical compound to attract electrons

Electronegativity tends to increase across a period

As radius decreases, electrons get closer to the bonding atom’s nucleus

Electronegativity tends to decrease down a group or remain the same

As radius increases, electrons are farther from the bonding atom’s nucleus

Slide 12

Periodic Table of Electronegativities

Slide 13

Periodic Trend: Electronegativity

Slide 14

Summary of Periodic Trends

Slide 15

Ionic Radii

Cations

Positively charged ions formed when

an atom of a metal loses one or

more electrons

Smaller than the corresponding

atom

Anions

Negatively charged ions formed

when nonmetallic atoms gain one

or more electrons

Larger than the corresponding

atom

Slide 16

Table of Ion Sizes