iodine
Arsenic
Several. Arsenic was once used as a rat poison and also has use in medicine (bone marrow disorders as an example. Thallium was once used as a rat poison and was once used to treat Syphillis Barium used to be used in rat poison and is used in medicine (barium meal) for some types of scan. Mostly these days however it is a compound that applies to both rather than an element - that being Warfarin.
Arsenic is used in rat poison and is in the title "Arsenic and Old Lace."
arsenic
Arsenic is a commonly used element in rat poison due to its toxicity to rats and other rodents. It interferes with their ability to produce energy at a cellular level, leading to their death.
bromide
Arsenic is used in rat poison and is in the title "Arsenic and Old Lace."
Anticoagulants such as warfarin and bromadiolone are commonly used in rat poisons. These substances work by preventing blood from clotting, leading to internal bleeding and eventually death in rodents.
Arsenic is a common rat poison often found in mystery titles. Arsenic and Old Lace
bromadiolone is found in rat poisons
Arsenic.
Arsenic (and Old Lace).