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
When you uninstall a software after itâs trial period has expired, all files are deleted except the keys in the registry. Therefore when you try installing it again, it detects the key and gives you a message like for e.g, âYour trial period has expiredâ.ow when you will reinstall the software, it wonât find any key in the registry which means it will install normally like if it is installing for the first time.
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