How can you get a negatively charged ion?

Answer 1

When atoms lose or gain electrons, they are called ions. As electrons are negatively charged, it is when they gain electrons that they become negative ions, if they lose electrons they become positive ions.

They can also form ions in pairs. for example

sodium atom (NA) gives up it's outer electron and becomes an NA+ ion.

the chlorine atom (CL) picks up the spare electron and becomes a CL- ion.

Answer 2

A negatively charged ion forms when an atom gains one or more electrons. This causes an imbalance between the number of protons (positive charge) and electrons (negative charge), resulting in an overall negative charge on the ion.