Whats the difference between iron and cooper

The key distinction between copper and iron is that copper is a chemical component with an atomic number of 29 and iron is a chemical component of 26 or a basic component of 29.

Explanation:

idk just searched it up

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.