Difference between atomic number and atomic weight?

The nucleus contains protons and neutrons. ... The main difference between atomic number and atomic weight is that atomic number gives the number of protons present in the nucleus whereas atomic weight gives the mass of an atom.

Explanation:

Atomic number refers to the number of electrons or number of protons, both of which are the same. Atomic weight refers to the total mass of protons and neutrons in an atom, which are focused in the nucleus of the atom (and take most of the mass).

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.