Why is the chemical symbol for chloride ion cl?

Answer 1

The chemical symbol for chlorine is Cl, which is normal as many chemical symbols are derived from from the first letter and second or third letter of an element's name.

the superscripted - sign means that the ion has an overall electric charge of -1.

Answer 2

The chemical symbol "Cl" represents the element chlorine, which forms a chloride ion (Cl-) by gaining an electron. The symbol for the chloride ion is often written as "Cl" to indicate that it has acquired a negative charge through the addition of an electron.