The element with 8 electrons in its 3d sublevel is Ni,
Nickel. The answer is letter D. The
rest of the choices do not answer the question above.
A polyatomic ion is a molecuar ion that is composed of more than one element. The elements in this molecule are chemically bonded and is a charge chemical species. These atoms act as a simgle unit. Examples are C2H3O2^- (acetate), CO3^2- (carbonate) and CrO4^2- (chromate).
Answer:
Sound waves are travelling vibrations of particles in media such as air, water or metal. So it stands to reason that they cannot travel through empty space, where there are no atoms or molecules to vibrate.
Explanation: