What does the sign represent with respect to electrons?
opposite spin of two electrons
different principal energy levels of two electrons
distances of two electrons from the nucleus
attraction between two electrons

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

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