State and explain the relationship between the variations in the first ionization energies and the atomic radii Use the information to answer the questions that follows. The table below gives some information about elements I, II,III and IV which are in the same periodic table. (a) Which two elements are likely to be in the same group of the periodic table? (b) Arrange the metals in order of their reactivity starting with the most reactive. The table below is a summary of the observation made and the formulae of the hydroxides formed. Four metals F,G,H and J were each separately added to cold water, hot water and steam. What do these values suggest about the reactivity of B compared to that of C? The table below shows the first ionization energies of element B and C. Explain why the reactivity of group (VII) elements decreases down the group An oxide of element F has the formula #F_2o_5# (a) Determine the oxidation state of F (b) In which group of the periodic table is element F. In each case show the sign of energy change involved. Write two equations to show how a neutral atom of hydrogen can form two ions. Study the information in the table and answer the questions that follow: Explain why: (i) the ionic radius of #K^+# is greater than that of #Na^+# (b) Arrange the elements D,E,F and G in the order of their reactivity starting with the most reactive. Use the reactions given below to answer the questions that follow ( The letters do not represent the actual symbols of the elements.) (a) What name is given to the type of reaction given above? Name one property of neon that makes it possible to be used in electric lamps.
Explain why hydrogen forms compounds in which its oxidation state is either +1 or -1 (Atomic number of hydrogen is 1) Study it and answer the question that follows: The information in the table below relates to elements in the same group of the periodic table. (The letters do not represent the actual symbol of the elements (i) What name is given to the group of elements to which C and F belong? (ii) Which letter represents the element that is the least reactive? (iii) What type of bond is formed when B and E react? Explain Study it and answer the questions that follow. (a) The grid given below represents part of the periodic table. Give two reasons why helium is used in weather balloons (a) Write an equation for the reaction between T and the ions of (iii) U liberates hydrogen gas from cold water but T does not. (ii) Hydrogen gas reduces heated oxide of S but does not reduce the heated oxide of X. (i) T displaces X from aqueous solution containing ions of X. (the letters do not represent the actual symbols of the elements). The information below relates to elements S,T,U and X. C is not the actual symbol of the element. Write the formula of sulphide of an element C, whose atomic number is 5. Arrange the elements in order of their reactivity starting with the most reactive. The table below gives the energy required to remove the outmost electron for some group I elements. (a) Select the: (i)element which has the largest atomic radius (ii)most reactive nonmetal (b) Show on the grid the position of the element J which forms #J^(2+)# ions with electronic configuration 2,8,8. The letters do not represent the actual symbols of the elements. The grid below shows part of the periodic table. Radius of element Y and its ionic radius. (c) Explain the difference between the atomic An element Y has the electronic configuration 2.8.5 (a) Which period of the periodic table does the element belong? (b) Write a formula of the most stable anion formed when element Y ionizes. (d) Which of the allotropes of phosphorus has a higher density? Explain. (b) Write the electron arrangement for the following ions: (i) #Ca^+# (ii) #P^(3-)# (c) What is the melting point of hydrogen in Kelvin? Study the table below and answer the questions that follow: (a) Complete the table by filling in the missing atomic numbers and atomic mass. (b) (i) Which two elements would react most vigorously with each other? (ii) Give the formula of the compound formed when the elements in b (a) Which one of the elements is least reactive? Explain. The table below gives the atomic numbers of elements of W, X, Y and Z. (b) What is the most likely formula of oxide of L? (c) Which element is a nonmetal? Explain. (a) Which two elements have two similar properties? Explain. The table below gives information on four elements represented by letters K,L,M and N.
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