Anyone know the answer plz help plz

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.)

Which element is the least metallic between cadmium, silver, zinc, or iron?

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles