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(a) Write an equation to show the effect of heat on the nitrate of:
(i) Potassium
(ii) Silver
(b) The table below gives information about elements A1, A2, A3 and A4

(i) In which period of the periodic table is element A2?. Give a reason
(ii) Explain why atomic radius of:
I. A1 is greater than that of A2
II. A4 is smaller than its ionic radius.
(iii) Select the element which is in the same group as A3.
(iv) Using dots(∙) and crosses (x) to represent outermost electrons, draw a diagrams to the bonding in the compound formed when A1 reacts with A4.