14. (i) Arrange the elements in the order in which they occur in the Periodic Table from left to right. (The group 1 element first, followed by the group 2 element and so on, upto group 7.)   15. (ii) Choose the word or phrase from the brackets which correctly completes each of the following statements. 1. The element below sodium in the same group would be expected to have a ............. (lower/higher) electronegativity than sodium and the Y element above chlorine would be expected to have a ............... (lower/higher) ionization potential than chlorine.   16. 2. On moving from left to right in a given period, the number of shells (remains the same/increases/decreases).   17. 3. On moving down a group, the number of valence electrons (remains the same/increases/decreases).