The "Chemistry and Life" box on ionic size in Section 7.3 compares the ionic rad...

The "Chemistry and Life" box on ionic size in Section 7.3 compares the ionic radii of and (a) The 2+ ion of which other element seems the most obvious one to compare to and ? (b) With reference to Figure 2.24, is the element in part (a) essential for We? (c) Estimate the ionic radius of the 2+ ion of the element in part (a). Explain any assumptions you have made. (d) Would you expect the 2+ ion of the element in part (a) to be physiologically more similar to or to ? (e) Use a sourcebook or a Web search to determine whether the element in part (a) is toxic to humans.