How do you determine a limiting or excess reagent? give me some sort of equation to follow, no links please​

The reactant that produces a lesser amount of product is the limiting reagent. The reactant that produces a larger amount of product is the excess reagent. To find the amount of remaining excess reactant, subtract the mass of excess reagent consumed from the total mass of excess reagent given.

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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.