1. Name the ion first. It is called a/an . 2. Name the ion second. It is called a/an .

3. The negative ion must end in if it is .

4. The correct chemical formula is empirical, containing the fewest and ions needed to make the total electric charge .

5. If the positive ion is POLYVALENT, the charge must be written as a in parentheses, after the cation, and before the anion.

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Following are the  advantages of the parametric equations: 1) they can be used to graph curves that are not functions, like the unit circle.2) the parameter can be used to represent the quantity that is  useful to  provide us with better information about the graph.3)  it is useful to convert between rectangular equations and parametric equations.with specific reference to chemistry,  parametric equations are employ for solving hydrogen and hydrogen-like ions, quantum mechanically. herein, cartesian coordinates are converted in spherical polar coordinates. the solution obtained, when plotted on spherical polar graph paper, provides visualization of atomic orbital such as s,p,d and f.