Electronegativity
Electronegativity: ability of an atom to attract pair of electrons to itself
Pauling scale: ranges from 0 - 4.0
Electronegativity trends
Electronegativity decreases down a group
Electronegativity increases across a period
Across a period
Electronegativity decreases
Radius decreases
More protons, smallest atom #
Why is fluorine more electronegative than chlorine?
- More protons in the nucleus
No stronger attraction
Adds extra orbital distance — atomic radii increases
Weaker attraction of electrons