Charge is charge, q. If you want it negative just add "-" by its value; some use -q to represent negative charges, too.
The chemical symbol for oxygen is "O" and it typically has a charge of -2.
Hydrogen is identified with a 'H' symbol and if dissolved in water it have a negative charge
e- is the symbol for an electron, aka a beta particle. It has a unit negative charge.
- minus for example negative5 is -5
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Iodide is iodine with a negative charge, and is thus written as I-.
It is the cyanide ion. There should be a single negative charge on it
Bromine on the periodic table is Br. 35 79.909
A cation has a positive charge and an anion has a negative charge.
A charge which is not a positive charge is a negative charge.
Electrons have an electrical negative charge.
Electrons carry a negative charge to balance out the positive charge of the proton.