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 $\mathit{R}\mathit{b}$.
(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.