Using the part of the Periodic Table given below, answer the questions that follow : (i) Na has physical and chemical properties similar to which element(s) and why? (ii) Write the electronic configuration of N and P. Which one of these will be more electronegative and why? (iii) State a chemical property common to fluorine and chlorine.

Using the part of the Periodic Table given below, answer the questions

1.	Using the part of the Periodic Table given below, answer the questions that follow : (i) Na has physical and chemical properties similar to which element(s) and why? (ii) Write the electronic configuration of N and P. Which one of these will be more electronegative and why? (iii) State a chemical property common to fluorine and chlorine.
Answer» Solution :(i) Physical and CHEMICAL properties of Na are similar to those of elements Li and K because they belong to the same group (Group I). (ii) Electronic configuration N : 2, 5 P : 2, 8, 5 Nitrogen atom being SMALLER in size than phosphorus, can hold the electrons more tightly than phosphorus. Electronegativity (or non-metallic character) decreases down the group. THEREFORE, N is more electronegative than P. (iii) Fluorine and chlorine both have ONE electron in the valence shell. Both of them have the valency 1.