What is the best way to tell which way the electrons are flowing in a voltaic cell (ie. to identify or which half-cell contains the reduction or the oxidation reaction)?

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in voltaic cells, electrons always flow from anode to cathode. to identify which half-cell contains oxidation or reduction, look up each elements standard reduction value: a more negative reduction value indicates it is as at the anode, and a more positive one indicates it is at the cathode