(b) 1,4,3,2All the four statements are about how the Periodic Table orders the elements in accordance with their proper-ties. Therefore, statement 1 is the first line of the sequence. Statement 4 directly exemplifies this statement; and statement 3 states the same in other words. Hence they follow in the same sequence. Finally, statement 2 explains how the periodic tablehelps, i.e., the electronic configuration of elements determines their properties and the recurring pattern ofthese properties gives the periodicity.