OK. One more lesson in chemistry. Are you getting tired from digging that hole?
Definition: Atomic mass or atomic weight is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element.
Also Known As: Atomic Weight
One, Mass and weight aren’t the same thing.
Two Relative atomic mass is the mass of the ratio of CL 35- CL 37. It has no meaning outside of the expected ratio which can very significantly.