Wikimedia Commons has an SVG, so you should be able to print it at poster size without issue. https://upload.wikimedia.org/wikipedia/commons/1/10/The_chemical_e

Wikimedia Commons has an SVG, so you should be able to print it at poster size without issue. https://upload.wikimedia.org/wikipedia/commons/1/10/The_chemical_elements_and_their_periodic_relationships.svg https://upload.wikimedia.org/wikipedia/commons/1/10/The_chem...