How do scientists determine the number of neutrons in an isotope of an atom?

a.
they find the number of protons.

b.
they divide the atomic mass by two.

c.
they add the number of electrons and protons.

d.
they subtract the atomic number from the atomic mass.

my best guess would be c, but i'm not sure.

Which would not reduce the amount of green house gasses in the air

Arock collection comes from which part of earth?

How do the measurements of charge at the different locations on the sphere compare to each other? the charge measurements are different at all locations on the sphere. the charge measurements are virtually not the same at all locations on the sphere except for the charge at the very top and at the very bottom that are equal. the charge measurements are virtually the same at all locations on the sphere except for the charge at the very top. at the top, the conductive sphere has a small disk that is made of different material. the charge measurements are the same at all locations on the sphere. what happens to the charge on the conductive sphere when it is connected to a source of charge such as the electrostatic voltage source? nothing will happen because no charge goes around the surface of the sphere. the charge on the conductive sphere spreads out over the surface of the sphere; being greater in some specific locations on the sphere. the charge on the conductive sphere spreads out uniformly over the surface of the sphere. the charge on the conductive sphere spreads out non-uniformly over the surface of the sphere.