When atoms body with other atoms in a chemical reaction, they seek to gain stability by obtaining a
outermost energy level.

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

What is a metal replacement reaction

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: