Write the half-reaction for the following oxidizing agents: Na+(aq)= Na(s)⇌ Na + (aq) + e –

Co2+(aq)=Co(s) ⇌ Co 2+ (aq) + 2 e –

Sn4+(aq)= Sn 2+ (aq) ⇌ Sn 4+ (aq) + 2 e –

thats how its supposed to be

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.

that's it!

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~ trueboss72