Answer: 2-
Each electron has a 1- charge, so two additional electrons would add a 2- charge to the previously neutral atom.
Can i guess, am i gonna give a suspension, so the graphite is gonna settle at the bottom
Concentration Definition. In chemistry, concentration refers to the amount of a substance per defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration usually is expressed in terms of mass per unit volume.