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Noble gases are more stable, so that is why we use the closest noble gas to write the shorthand electron configuration. It just makes it easier to write out the configuration when we use the shorthand method using the noble gases.
We are able to use the noble gases as a shortcut when writing out the configurations because they are perfect octets, meaning all of their orbitals have paired electrons. Since this is true, you can start at whatever the noble gas right before the element you are writing the configuration for on the periodic table and then build off of that since you are basically starting with the next empty orbital down the list. Hope this makes sense!
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