Balance the nuclear reaction equation for the beta minus decay of nickel-63 by completing the missing
numbers.
2.Ni → 63 Cu + je
The superscript of nickel is ?
The subscript of copper is ?

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.