Periodic Trends/Properties

Atomic Radii
Half the distance between nuclei of identical atoms bonded together
Radii Trend
As you go across a period, the radii decreases
As you go down a group, the radii increases
Ionization Energy
Energy required to remove one electron from a neutral atom
Ionization Energy Trend
As you go across a period, the energy increases
As you go down a group, the energy decreases
Electron Affinity
Energy change when an electron is gained
Electron Affinity Trend
As you go across a period, electrons are gained more easily
As you go down a group, electrons are harder to gain
—(across = higher neg number, gain = lower neg number)—
Electronegativity
Measure of an atom in a chemical compound to attract electrons from another atom in a compound
Electronegativity Trend
Across a period, increase
Down a group, decrease or remain the same
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