PLEASE HELP !! What is the atomic mass of an element with 3 isotopes with the following information: Isotope 1 - 42 amu (75% abundance)
Isotope 2 - 44 amu (10% abundance)
Isotope 3-45 amu % abundance)

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.

answer:

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