The average mass of an atom of a element is the
the whole number in the periodic table square
one zillionith of a hamster
the decimal number in the periodic table square
the same for every element
If a chlorine atom weighs 35 amu , it is the same mass as
the mass of 35 carbon atoms
one zillionth of a hamster
the mass of 35 hydrogen atoms
the mass of 35 helium atoms