potassium perrhenate and rhenium trichloride, which were injected as a solution into rats. The perrhenate had an LD50 value of 2800 mg/kg after seven days (this is very low toxicity, similar to that of table salt) and the rhenium trichloride showed LD50 of 280 mg/kg. References External links Rhenium at The Periodic Table of Videos (University of Nottingham) Chemical elements Transition metals Noble metals Refractory metals Chemical elements predicted by Dmitri Mendeleev Chemical elements with hexagonal close-packed structure Native element minerals