Which statement correctly describes an atom of the element helium? (9) a. an atom of helium has a full outer energy level and is therefore unusually reactive. b. an atom of helium has eight electrons in its outer energy c. an atom of helium has its valence electrons in its first energy level. d. an atom of helium most similarly behaves like an atom of hydrogen since it is in the same period.

C. An atom of helium has its valence electrons in its first energy level, it wouldn't and can't satisfy the Octet rule as it only has 2 electrons, but with 2, it has a full shell, as the first energy level can hold only 2 electrons.

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.