Chlorine is a chemical element with atomic number 17 and symbol Cl. It belongs to the halogen group and exists as a diatomic gas under standard conditions.
The 'identification number' for elements, just like synchronized swimmers have their own numbers for recognition.
Halogen Group: A group/family of elements in periodic table including fluorine, bromine, iodine, etc., which exhibit similar chemical properties to chlorine.
Diatomic Gas: Imagine two synchronized swimmers holding hands while swimming together - that's exactly how chlorine exists as molecules consisting of two atoms bonded together.