9. which choice represents a group of elements with common characteristics? a. silver, iodine, helium b…

Brief Explanations:

Elements in the same group or category often have common characteristics. Copper, gold, and silver are all metals and share metallic properties like high electrical and thermal conductivity, malleability, and ductility. In options A, B, and C, non - metals are mixed with metals or other different types of elements.

Answer:

D. copper, gold, silver