SCH 3U Assignment The variation of the atomic properties Name Part 1 715 Part A. Application Purpose ; To use the data c

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SCH 3U Assignment The variation of the atomic properties Name Part 1 715 Part A. Application Purpose ; To use the data collection, to build graphs of the variation of a property against the atomic number. Introduction: In this exercise you will plot a property (ionization energy and electronegativity) against the atomic number of the elements. You will examine the graph to find out whether there are any regular variations in the property. Using your graph for the ionization energy continue to plot the data for elements 21-36. Join consecutive points with solid straight lines. When datum for an element is missing. join the points by a broken straight line Part B: Graphing Electronegativity. Knowledge 110 You will plot a graph of electronegativity against atomic number. Using electronegativity values in the periodic table, plot a point graph of electronegativity against the atomic number for the first 36 elements. Place the electronegativity values in the following chart (10marks)

5.1 7,6 You must hand in all four graphs. Write your name on each graph paper. Data: Atomic 1" ionization Atomic Radius Tonic radius Number Electronegativity energy (V) (pm) To be continued To be completed 1 13.6 31 2 24.6 XX 3 5.4 152 4 9.3 111 5 83 79 6 11.3 77 15(for 4tion) 7 14.5 74 8 13.6 73 9 17.4 71 10 21.6 XX 11 186 12 160 13 6.0 143 14 8.2 117 41(for 4tion) 15 110 110 16 10.4 102 17 13.0 99 18 15.8 XX 19 4.3 227 133 20 6.1 21 6.6 22 6.8 23 6.7 24 6.8 25 75 26 7.9 27 7.9 28 7.6 29 XX 30 31 6.0 32 33 10.0 34 9.7 35 11.8 36 14 12 三星G5555553-2 197 9.4 8.1

SCH 3U Assignment The variation of the atomic properties Name Part 2 Purpose To determine whether there is any regular variation in the properties of elements when the elements are arranged in order of increasing atomic number. Introduction: In this exercise, you will examine the graphs to find out whether there are any regular variations in the property Part A: Communication 114 Answer the following questions: 1. Explain the significance of the peaks on the graph of the 1" ionization energy vs atomic radius. (5 marks) 2. Would you expect the value of the property you plotted (first ionization energy) to be higher or lower for element 37 than for element 36?(1 mark)

2. Look at the electronegativity vs atomic number graph. Describe two trends you detect by identifying portions of the graph that show the trend? Suggest explanations for the trends. (6marks) 3. What do you estimate to be the missing value of the 1 ionization energy, for element #297 Use the graph to find the missing value. Using arrows, show on the graph, how did you find the missing value. (2marks) lonization energy Part B: Thinking/Investigating 18 Using your periodic table, select an appropriate element that satisfies the condition given (1mark each) a clement with the highest electronegativity b. particle with the larger radius: Caion or Mgion. c. halogen with the highest lE. d. element with the highest EA in G16: e. A positive ion is (larger / smaller than its parent atom.

f. As you go from left to write across a period, the electron affinity (decreases/ increases). g. Arrange the following elements in order of increasing the atomic radius. Sc, Ga, Co h. Arrange the following elements in order of increasing reactivity. S, Te, o,