sulfur
Iodine on heating gives off dense purple vapor.
Francium is a radioactive chemical element an can disintegrate.
Silver does not have an exact smell nor a strong one Ed: Actually, it does, but the smell is hard to describe. Try smelling a genuine silver item and then compare it to other (perhaps supposedly) silver items. This is a great method if you are interested in antiques and want to see if a certain item is genuine silver. Good luck!! =D
The metal used as an alloy in ballpoint pens is bismuth. Its strong odor results from the highly toxic bismuth oxide, which forms when bismuth is exposed to air. Bismuth is almost twice as dense as lead, making it a suitable material for use in pens.
The durian fruit is an unusual core fruit of Asian origin, known for its strong odor and unique taste. This tropical fruit has a spiky outer shell and custard-like inner flesh. It is often described as having a combination of savory and sweet flavors with a strong smell that some people find off-putting.
Cyanide can give off a bitter almond smell, but doesn't always give off an odor, and not everyone can detect this odor.
Iodine is the element that gives off violet vapor when heated.
When the shell of a snail develops a nasty slime and gives off a horrible odor.
Sulfur is a yellow element that smells of rotten eggs.
it gives off toxing in the body
fireflies send off a strong odor which draw predators away.
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,
Distinct is an adjective. "Rotten milk gives off a distinct odor."