Question

Using the part of the periodic table given below, answer the questions that follow:

(i) Identify the elements with which K has similar physical and chemical properties.

(ii) Out of Li, Be, C which one has smallest atomic size? Give reason for your answer.

(iii) Out of O and S, which one of them is more electronegative and why?

Answer 1

(i) Li and Na have similar physical and chemical properties as that of K because they have same valence shell electrons.
(ii) C has smallest atomic size because atomic size decreases along a period as increase in nuclear charge tends to pull electrons closer to nucleus.
(iii) O is more electronegative than S because oxygen atom being smaller in size than sulphur, can hold the electrons more tightly than sulphur.