Since it has 1 more electron than protons, chlorine has a charge of −1, making it a negative ion. When ions form, atoms gain or lose electrons until their outer energy level is full.

What is the charge of beryllium?

It's nearest noble gas is Helium, which is 2 elements behind Beryllium. Thus, Beryllium wants to lose two electrons. When it does that, Beryllium will have a positive charge of two, and it will be stated as B-e two plus.

What is the charge of fluorine ion?

A fluorine atom has nine protons and nine electrons, so it is electrically neutral. If a fluorine atom gains an electron, it becomes a fluoride ion with an electric charge of -1.