Cl
In short
Chlorine is a highly reactive chemical element with the symbol Cl and atomic number 17.
In plain words
It is a yellow-green gas that is very good at reacting with other substances. Because it is so strong at reacting, it is often used to kill germs in water.
A simple example
When chlorine is added to a swimming pool, it reacts with bacteria to keep the water safe for swimmers.
Why it matters
It is essential for making clean drinking water and various household products like bleach. Its high reactivity makes it a key tool in industrial chemistry.
Easy to mix up
Do not confuse the chemical symbol Cl with the abbreviation for 'clear' or 'clockwise'.