Marie curie was the recipient of two nobel prizes—a shared prize in physics and an individual prize in chemistry. her chemistry prize was for discovering two new elements, polonium and radium. for what did she, her husband, and henri becquerel receive the physics prize?

-the discovery that radioactivity is an extensive property that can be measured precisely.
-the discovery that certain substances can phosphoresce.
-the discovery that radioactivity is caused by the decay of unstable atomic nuclei.
-the discovery that radioactivity can ionize gas in a chamber.

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.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8