(a) In this ladder (Figure) symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic numbers in the periodic table
(b) Arrangement them in the order of their group also
.

Explanation

(a) H, He, Li, Be, B, C, N, O, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Br.
`{:("Group 1- H, Li, Na, K" , "Group 15 - N, P",),("Group 2 - Be, Mg, Ca","Group 16 - O, S",),("Group 13 - B, Al","Group 17 - Cl, Br",),("Group 14 - C, Si","Group 18 - He, Ne, Ar",):}`