Element X has an electronegativity of 3.30. Element Y has an electronegativity of 3.25. The molecule XY is then best described as a:
In a covalent bond, a slight difference in electronegativity (between 0 and 0.4) is considered a nonpolar bond. 0.4-1.6 is considered a polar covalent bond. Ionic compounds have a difference greater than 1.7. The difference above is very small (0.05) so the X-Y bond is nonpolar.