Classify the following reaction as: Cu3(CO3)2 (s) > 3CuO (s) + 3CO (g)

plasma - state of matter made up of electrically charged particles

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.