system
Given the following post, respond as if you're commenting on Reddit:
human
What is the most amount of electrons forcibly added to an atom?

So like the title says, I know ionization energy increases with each additional electron taken away, I assume the reverse is true for adding electrons. How many electrons has someone tried to add to an atom in a laboratory? How unstable was it, how long did it last? What chemical properties were attained from the extremely negative ion?
gpt
Only one electron can be added to a neutral atom. All doubly charged negative atomic ions are unstable with respect to electron detachment. This often comes as a surprise to chemists who are used to writing things like O^2- . There are some large organic molecules which have stable, doubly-charged anions, but such examples are fairly rare.