There are 3 main types of bonds: <u>Nonpolar covalent, polar covalent, and ionic</u>. All of them have multiple aspects that set them apart from each other, but in this case, the electronegativity difference is the focus. Electronegativity difference is the difference in the electronegativity values of 2 atoms. For example, Nitrogen has an electronegativity value of 3.04 and Oxygen is 3.44, so their electronegativity difference is 0.4.
Electronegativity values that range from <u>0 to 0.4 are nonpolar covalent, 0.5 to 1.9 is polar covalent, and 2 and above is ionic</u>. Since the difference in this question is 0.4, the bond must be nonpolar covalent.
Transparency (also called pellucidity or diaphaneity) in the field of optics is the physical property of allowing light to pass through the material without significant light dispersion.
