# Solution: The atomic masses in the periodic table are not integral num...

###### Question

The atomic masses in the periodic table are not integral numbers. For example, carbon is listed as 12.01115 instead of 12.00000. What is the reason for this?

A. Atoms gain and lose electrons easily, significantly changing their masses.

B. Measurements taken of atomic samples are contaminated with other elements.

C. Technology does not allow for exact measurements of such small quantities.

D. The listed values are weighted averages of naturally occurring isotopes.

E. There is a theoretical uncertainty in the masses of atoms.