What is the main benefit of this model? Atom structure
+ Proton
Neutron
Electron
A. It helps scientists make predictions about how atoms form.
B. It shows the parts of an atom that are too small to be seen.
C. It demonstrates that all atoms have the same number of parts.
D. It explains why there are different kinds of atoms.

Atomic models are important because, they help us visualize the interior of atoms and molecules, and thereby predicting properties of matter.

Explanation:

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.