To interpret serum calcium levels accurately, serum albumin levels and acid–base status must be considered. true or false?

True.
Albumin proteins bind some of the calcium, and changes in pH can affect the true reading of serum calcium.

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