# By what property is electronegativity determined?

Nov 15, 2016

$\text{Electronegativity}$ is defined as the ability of an atom involved in a chemical bond to polarize electron density towards itself. Electronegativity tends to increase across a Period (from left to right as we face the Table) and decrease down a Group.
And thus fluorine, to the right of the second Period, $Z = 9$, is more electronegative than hydrogen, $Z = 1$.