Period Trends

Ionization Energy
the amount of energy needed to completely remove an electron from an atom
anion

a negative ion

*formation causes an increase in atomic radius

cation

a positive ion

*formation causes a decrease in atomic radius

Trend for Atomic Radii

DECREASE across

 

INCREASE down

Atomic Radius
One half the distance between the nuclei of identical atoms that are bonded together
Trend for Electronegativity

INCREASE across

 

DECREASE down

Trend for Ionization Energy

INCREASE across

 

DECREASE down

Electron Affinity
the amount of energy when an atom gains an electron
Trend for Electron Affinity

INCREASES across

 

DECREASES down

Valence Electrons
Electrons that can be lost, gained, or shared during the formation of chemical compounds
Trend for Ionic Radii

DECREASE across

 

INCREASE down

Electronegativity
an atoms ability to attract a pair of electrons in a covalent bond
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