12.X is an alkali metal having a set of quantum number n = 3, 1= 0, and m=0. Y is a reactive gas belongs to halogen family having atomic mass 35.5amu. Z is a transitional metal having completely filled lowest d-orbital and only one electron in its penultimate shell, n = 4 after jumping electron among the orbital. Answer the following questions. [5xl=5] a) How many number of S-electron present in Z+. b) Write all possible quantum numbers for the valence electron of Y. c) Write the electronic configuration of Z-. d) What are the shapes of valence orbital of X and Y? e) Among X, Y and Z which element shows the exception of Auf-bau principle? Why