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(1) Half-reactions are written as ______ reactions with charge and mass balanced. (2) Among the ions, Cd^2+, Pb^2+ & Ca^2+, ________ has the greatest...

(1) Half-reactions are written as ______ reactions with charge and mass balanced.
(2) Among the ions, Cd^2+, Pb^2+ & Ca^2+, ________ has the greatest ability to reduce to its neutral metal.
(3) Among the neutral metals; Pb, Ca & Cd, ________ has the least ability to oxidize to the +2 ion.
I really need help for 2 & 3, but for the first one, half-reactions are written as oxidation reactions, right?

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