15. The table below gives the atomic numbers of elements W, X, Y and Z. The letters donot represent the actual symbols of theelements.Element W X Y ZAtomic number 9 10 11 12(a) Which one of the elements is less reactive?Explain....................................................................................................................................(b) (i) Which two elements would react most vigorously witheach other? (1 mark)..............................................................................................................................................................................................................................................................................(ii) Give the formula of the compound formed when the elements in b (i) abovereact....................................................................................................................................

Study the information in the table below and answer the questions that follow. Theletters do not represent the symbols of the elements.Element(C) Atomic number Melting pointL 11 97.8M 13 660N 14 1440Q 17 401R 19 63.7a) Write the electrons arrangement for the atom formed by elements and M andQ........................................................................................................................................................................................................................................................................b) Select an element whichisi) The most reactive non –metal...........................................................................................................................ii) A poor conductor ofelectricity...........................................................................................................................c) In which period of the periodic table does elements Rbelow.....................................................................................................................................d) Element R lodes its outermost electron more readily than I.Explain

10. Study the information below and answer the questions that follow. Letters W, X and Y represent elements in10the periodic table but not the actual symbols of the elementsW has atomic number 8, while X has atomic symbols of the elementsY is in the same period with X and reacts with W to form an ionic compound Y, W(a) Place elements W and X in their correct positions in the grid below which representspart of the periodictable.(b) Write electronic configuration for of the ions in compound Y,W

11.An element X has atomic number 30 while element Y has atomic number 8(a) Write the electron arrangementforX (1mark).............................................................................................................................................................................................................................................................................(b) What type of bond would be formed when X andYreact

3.(a) The table below shows the atomic numbers of elements of the periodic table representedby letter J toQ.The letters are not the actual chemical symbols for the elementsElement J K L M N P O QAtomicnumber3 7 8 9 10 12 13 1410(i) Select two elements which belongto:I The same period of theperiodictable (1 mark)..............................................................................................................................................................................................................................................................II The same group of the periodictable.............................................................................................................................................................................................................................................................(ii) Select theelementwhich (1 mark)I Will form a divalentunion....................................................................................................................................................................................................................................................................II Reacts most vigorously withwater.....................................................................................................................................................................................................................................................................(b) The boiling points of some chloride are shown in the tablebelow:Group I II III IV V VI VIIChloride LiCl Chlorideof WBCl 3 CCl 4 NCl 3 OCl 2 FClB.P. ( 0 C) 1350 487 12 77 71 2 -101Chloride Nacl Mgcl 2 AlCl 3 Chlorideof XPCL 3 SCl 2 Cl 2B.P. ( 0 C) 1465 1418 Sublimesat 18057 74 59 -35(i) What is the most likely formulae for the chlorides of W andX?...................................................................................................................................................................................................................................................................(ii) Select two chlorides from the table which are the most ionic. Explain why the twoelected chloride are the mostionic.......................................................................................................................................................................................................................................................................(iii) Would you expect group VIII elements of the periodic table to form chlorides?Explaintheanswer (1mark)

15. The elements with the smallest atomic radii tend to be found in which part of the periodic table?1 pointThe upper left cornerThe bottom left cornerThe bottom right cornerThe upper right cornerThe inner transition metals