What part of the periodic table contains elements which behave as strong oxidizing agents?
Transition metal compounds, especially of first period (principally Mn with 7+ and Cr with 6+ charge).
As for elements in their ground state, Group 7 elements (halogens) are good oxidizers. As you go up and to the right on the Periodic Chart, elements become more electronegative, and better oxidizers.
Even simpler than that would be a table located in the back of just about every gen chem book. It will be listed as reduction potentials. Go to the bottom of the chart and work your way up from best oxidizer to worst. It is not a complete table, but should be good enough.
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