(a)(i) 1. State the periodic law.

2. What is meant by the term periodic property of elements?

(ii) List three properties of an element which show periodicity.

(iii) Explain briefly how each of the properties listed in (a)(i) in varies across the period.

(b) Defulle relative atomic mass.

(c)(i) What phenomenon is exhibited by an element Z which exist as \(^{35}_{17}Z\) and \(^{37}_{17}X\)

(ii) What accounts for the difference in the mass numbers of the element Z?

(iii) Calculate the relative atomic mass of Z if the percentage abundance of \(^{37}_{17}Z\) is 75%

 

(d)(i) State the method used for collecting each of the following gases: I. CO II. HCI  III. H\(_2\)  

(ii) Give a reason for your answer stated in (d)(i) I and II