Compounds including both a metal element and a non-metal element bonded together do not form molecules. Their diagrams look quite different, this is called a lattice .

High Pressure Yields Novel Single-element Boron 'Compound'. ScienceDaily. Retrieved June 4, 2025 from www.sciencedaily.com / releases / 2009 / 01 / 090128215130.htm. Stony Brook University.

Learn about elements, compounds and mixtures in this KS3 Chemistry guide from BBC Bitesize.