Suppose a student conducts an experiment in which Mn2 reacts with another substance and forms MnO42-. Is Mn2 the oxidizing or the reducing agent and how many electrons does manganese gain or lose in this reaction

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

i think it is true since you can test the answer and can use observations to complete it.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).