June 2011 Chemistry Regents #55-59

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Questions

Base your answers to questions 55 through 59  on the information below. The ionic radii of some Group 2 elements are given in the table below. 55 On the grid in your answer booklet, mark an appropriate scale on the axis labeled “Ionic Radius (pm).” [1] 56 On the same grid, plot the data from the data table. Circle and connect the points. [1] Link TO SEE THE ANSWER 57. Estimate the ionic radius of strontium. [1] HIGHLIGHT TO SEE THE ANSWER 117pm (+/- 2pm) 58. State the trend in ionic radius as the elements in Group 2 are considered in order of increasing atomic number. [1] HIGHLIGHT TO SEE THE ANSWER As atomic number increases, IONIC radius increases 59. Explain, in terms of electrons, why the ionic radius of a Group 2 element is smaller than its atomic radius. [1] HIGHLIGHT TO SEE THE ANSWER group 2 ions have lost an energy level of electrons group 2 ions have 2 less electrons than their atoms on to Questions 60-61

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