Which phrase correctly describes the outer shell of electrons of each atom in most covalent compounds? a. often the outer shells has eight electrons b. an unstable arrangement of electrons exists for each atom c. more than eight electrons in in each atom's valence shell d. fewer than eight electrons in each atom's valence shell

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

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.