The electro negativities (according to pauling) of the elements in periodic table are as follows with the elements arranges in alphabetical order: AI        CI      Mg       Na    P       S       Si 1.5  3.0  1.2   0.9   2.1  2.5  1.8(a) 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, up to group 7)(b) Choose the word or phrase from the brackets which correctly completes each of the following statements:-(i) The element below sodium in the same group would be expected to have a………. (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a ……. (lower/ higher) ionization potential than chlorine.(ii) On moving from left to right in a given period, the number of shells (remains the same/ increases/ decreases).(iii) On moving down a group, the number of valence electrons (remains the same/ increases/ decreases).