it gives off toxing in the body
Iodine is the element that gives off violet vapor when heated.
Sulfur is an element that gives off a strong odor, often described as resembling rotten eggs.
This is a radioactive chemical element.
It means the element is unstable and gives off dangerous particles.
Radioactive
Radium is an example
Oil and gas,
Neon
Chlorine is the element that burns with a blue flame and gives off a highly acidic gas when it undergoes combustion.
Uranium is a natural, radioactive chemical element.
It is still active and has internal heat
Iodine on heating gives off dense purple vapor.