Is condensation a chemical or a physical change?

How will the emission of an alpha particle affect the atomic number of an atom

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.)

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.