A negativley charged ion is the answer
They try to base their conclusions off of data and measurements of which they should record from conducting experiments
Now I'm just going to assume you mean Charles law. So when working with gases, there are 4 properties: pressure, volume, temp, and quantity. The simple gas laws deal with 2, while leaving the other 2 constant. If Charles' Law changes temp and volume, what 2 stay constant? Pressure and quantity
(2) three fewer valence electrons is your answer.
