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)
Question
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)
Solution
(i) I. The elements that belong to the same period of the periodic table are M (9) and N (10) because they are in the same row. II. The elements that belong to the same group of the periodic table are J (3) and P (12) because they are in the same column.
(ii) I. The element that will form a divalent union is P (12) because it has two electrons in its outer shell. II. The element that reacts most vigorously with water is K (7) because it is an alkali metal and they react vigorously with water.
(b) (i) The most likely formulae for the chlorides of W and X are WCl2 and XCl4 because the number of chlorine atoms usually matches the group number of the element. (ii) The two chlorides from the table which are the most ionic are LiCl and NaCl. This is because they are formed from elements in Group I (alkali metals) and Group VII (halogens), which have the highest and lowest electronegativities respectively, leading to a large difference in electronegativity and therefore a strong ionic bond. (iii) I would not expect Group VIII elements of the periodic table to form chlorides because Group VIII elements are noble gases and have full outer electron shells, so they do not readily form compounds.
Similar Questions
. Periods on the periodic table represent elements:1 pointin the same groupwith consecutive atomic numbersknown as isotopeswith similar chemical properties
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Write the atomic number of the element present in the third period and seventeenth group of theperiodic table.
3. How are elements represented in the periodic table?a. By their atomic number.b. By their mass number.c. By their electron configuration.d. By their physical state at room temperature.
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
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