What is the difference between oxidation and reduction

Oxidation is giving out one or more electrons gaining a positive charge.

Reduction is taking one or more electrons and gaining a negative charge

➷ Oxidation is the loss of electrons whereas reduction is the gain of electrons. You can remember this using OILRIG (Oxidation Is Loss, Reduction Is Gain.)

➶ Hope This Helps You!

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answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

you need to have a picture of the atom that way we can answer it