In one compartment of a voltaic cell, a graphite electrode dips into an acidic solution of K2Cr2O7and Cr(NO3)3. In The other, a bar of solid tin dips into a Sn(NO3)2 solution. A KNO3 salt bridge joins the two compartments. The tin electrode is negative relative to the graphite. What is the oxidation half-reaction and what is the reduction half-reaction?

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3 1/4 %

explanation:

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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