Anurse is assessing a client who has acute respiratory distress syndrome

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass

Your answer is water because there is combined mass of water found on, under, and over the surface of a planet. your answer is water.