If the oxidation number of a particular atom is not known it may be deduced from the known oxidation numbers of other atoms associated with it in a molecule. For example, the oxidation state of Pu in PuO$_2^{2+}$ is not known. It is calculated as. charge on Pu in PuO$_2^{2+}$ + charges on two O's (or 4-) = charge on PuO$_2^{2+}$ or 2+ thus Pu has an oxidation number of 6+. In some cases (S$_2$O$_4^{2-}$, Fe$_2$O$_3$) the oxidation number can be fractional. Thus oxidation numbers can be negative, positive, zero or fractional. Of course the same atom can have different oxidation numbers in different molecules. An example is shown below for nitrogen
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You can also set options for items to be deleted when they expire. Items are stored in their archived locations unless you change one or more AutoArchive settings, or choose to have the items automatically deleted when they expire.hange the AutoArchive settings for an individual folder. In the folder list in the Navigation Pane, right-click the folder that you want to change, and then click Properties on the shortcut menu. On the AutoArchive tab, select the options that you want. Top of Page.