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Each one of the following statements applies to an element or elements from one of the main groups (1A through 8A). Identify the group number appropriate to each of the statements, and write it in the left hand margin alongside that statement.
a. This group contains the element with the lowest ionization potential of any element.
b. The maximum oxidation number of any element in this group is +5.
c. An element X in this group forms a stable, unreactive gas, XF6.
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