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For problem 23 in chapter 2, after writing the ground-state electron configuration for each element it asks us to predict the number of unpaired electrons. How exactly do we know which ones will be unpaired?
Unpaired electrons are any electrons that don't have a another electron (with opposite spin) in their orbital. Draw out the Aufbau diagrams for each element using the rules from lecture and you'll be able to see which electrons don't have a buddy!
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