The total number of the protons and neutrons is the atomic

charge
weapon potential
evaporation rate
weight

The answer to your question is: weight

Explanation:

The total number of the protons and neutrons is the atomic weight.

Charge                    charge of an atom does not depend on the number of

                              protons and neutrons.

Weapon potential    This answer is incorrect because the number of protons

                                 and neutrons do not depends  on the weapon potential.

Evaporation rate    Evaporation rate do nt depend on the number of protons

                                and neutrons.