Definition of density in a really simple kid friendly way .

Density is a measurement that compares the amount of matter an object has to its volume. An object with much matter in a certain volume has high density. An object with little matter in the same amount of volume has a low density.

Density is found by dividing the mass of an object by its volume.

p=m/v

where ρ is the density, m is the mass, and V is the volume.

since electrons are negative the answer is neagtaive

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.