An extension of CHEM 241 with emphasis on the bonding, structure, and reactivity of transition-metal elements. The course will include applications in industrial, biochemical, environmental, and materials science. For students in Chemistry Honors, Specialization, and Major Programs only, except by consent of Department. Prerequisites: CHEM 241 or consent of Department. Students who have obtained credit for CHEM 243 cannot take CHEM 343 for credit.