which element has smallest atomic volume??
.
Helium has the smallest atom by size and hydrogen has the smallest atom by mass.
.
Helium is the atom having smallest size. The atomic radius gets smaller because the electron orbit fills up the form an octet and for each of additional , a proton is added to the nucleus pulling the electron shells closer around the nucleus.
.
Coming to the final point that what has the smallest atom. Its Helium