Final answer:
The assertion that a proton's mass is 1.00728 amu is false; the actual mass of a proton is around 1.0073 amu, which is approximately the same as that of a neutron.
Step-by-step explanation:
The statement that the mass of a proton is 1.00728 amu is false. Instead, the mass of a proton is approximately 1.0073 amu. The slight discrepancy may be due to rounding or erroneous representation of the value. It is important to note that protons and neutrons have approximately the same mass, which is about 1.0073 amu for protons and 1.0087 for neutrons, according to atomic mass units (amu). Electrons are much lighter, with a mass of approximately 0.00055 amu, suggesting that it would take about 1800 electrons to equal the mass of one proton. Moreover, an atomic mass unit is defined as one-twelfth the mass of a carbon-12 atom, and the proton has a charge of 1+. This information helps in understanding atomic structure and the mass of subatomic particles, which are fundamental in chemistry.