Give the electron configuration for a neutral atom of chlorine

The answer to your question is below

Explanation:

                           ₁₇Cl = 1s² 2s² 2p⁶ 3s² 3p⁵

4d^55s^1 ( third choice)

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.