Check the listing for details. Bromine Monovalent Atom Centers Brown 17mm 10CS122 Molecular Chemistry Model. Condition: Used. Listed at 69.99 USD. CRATE MM The Bromine Monovalent Atom Centers Brown 17mm 10CS122 Molecular Chemistry Model is a set of educational toys and hobbies designed to promote learning in molecular chemistry. Specifically, this product consists of 10 brown 17mm molecular chemistry models featuring bromine atoms. These models are useful for students and educators looking to explore the properties of bromine atoms in a tangible and visual way. This toy is a valuable tool for those interested in science and nature, offering a hands-on approach to understanding complex chemical concepts.