Which set of the electronic structure are only found in non-metals? A 2, 5 2,8,6 2,8,7
B 2,7 2,8,4 2,8,8,1
C 2,1 2,8,3 2,8,8,2
D 2 2,8,1 2,8,3

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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.