Fluorine
/ˈflɔːriːn,ˈflʊriːn/
Definition 1 of 1
Pro Tip 1/3Safety Precautions
Fluorine is highly reactive and can be dangerous; mention safety when discussing its use. 
Due to its reactivity, handling fluorine requires strict safety measures.
Pro Tip 2/3Scientific Context
Fluorine is often discussed in scientific and industrial contexts, less so in everyday life. 
In chemistry class, we learned how fluorine reacts with other elements.
Pro Tip 3/3Non-Visible Gas
While fluorine is a gas, it is not visible; usage implies it’s understood through scientific study. 
Fluorine, though invisible, has a distinct, pungent smell.