In a titration experiment, C2O42- reacts MnO4- with as represented by the equation above. The dark purple KMnO4 solution is added from a buret to an acidified colorless solution in an Erlenmeyer flask.
At some point in the experiment, the rate of appearance of Mn2+ ions was 1.0 x 10-4M/s. What was the rate of disappearance of C2O42-?

false

because it does not have the potential to be entirely used up

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.