Which of the following molecules contains a covalent bond? (Use the electronegativity values from the periodic table link to help you answer this question.)
If the electronegativity difference is less than 1.6 or when the difference is 1.6 - 2.0 and it only involves nonmetal, then the molecule contains a covalent bond. A. HF: 4.0 - 2.1 = 1.9 (Covalent) B. LiCl: 3.16 - 0.96 = 2.2 (Non-covalent) C. CN-: 3.04 - 2.65 = 0.39 (Covalent) D. MgO: 3.44 - 1.31 = 2.13 (Non-covalent)
