The position of eight elements in the Modern Periodic Table is given below where atomic numbers of elements are given in the parenthesis. (i) Write the electronic configuration of $\mathrm{Ca}$.(ii) Predict the number of valence electrons in $\mathrm{R\,b}$.(iii) What is the number of shells in $\mathrm{Sr}$ ?(iv) Predict whether $\mathrm{K}$ is a metal or a nonmetal.(v) Which one of these elements has the largest atom in size ?(vi) Arrange $\mathrm{Be},\,\mathrm{Ca},\,\mathrm{Mg}$ and $\mathrm{Rb}$ in the increasing order of the size of their respective atoms.