KCET 2014 Chemistry Solved Paper

Between atomic number 1 to 36 only 3 alkali metals, hydrogen atom and 2 d-block elements (i.e., to make most stable electronic configuration) appears which have an unpaired electron in their s-subshell. Therefore, total 6 elements, that is, H, Li, Na, K, Cr and Cu between atomic number 1 to 36 appears.