Question

The Periodic Table of Elements He B CNOFNe Al Si PS CI Ar K Ca ScT V Cr Mn Fe Co Ni Cu Zn Ga Ge As SeBr Kr Rb Sr YNbM Ru Rh Pd Ag Cd In n Sb TXe Hf Ta W Re Os r Pt Au Hg T PbBi Po At Rn Li Be Cs Ba Fr Ra Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Lu What is the configuration for the valence electrons in chlorine? Do not include the core electrons in the configuration. Provide your answer below:

Answer 1

The valence electrons configuration is

3s^2 3p^5
Since, whole electronic configuration for 'cl' can be written as, cl(17) rightarrow 1s^2 2s^2 2p^6 3s^2 3p^5 It has atomic number of 17. Configuration only for valence electron will be, 3s^2 3p^5 since, outermost shell is valence shell. Here n = 3