Polar and Nonpolar Molecules

What two things make a molecule polar?

Asymmetrical electron distribution;

Electronegativity

The ability of an atom to attract shared electrons

Electronegativity increases across from ____ to ____

left, right

Electronegativity in a group decreases from ___ to ______

top, bottom

For polarity to occur between two molecules, the difference between their electronegativities must be ____ or greater

0.5