Use the table below to calculate the atomic mass of element X. Round the answer to two decimal places. Then use the periodic table to identify the element. Isotope Mass (amu) Percent Abundance 28X 27.981 92.21% 29X 28.980 4.70 % 30X 29.969 3.09%

the answer is d. 74.02

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.