The atomic number of oxygen is 8, because oxygen has a. electrons in eight shells. b. eight protons in the nucleus. c. a second shell with eight electrons. d. an atomic mass of 8.

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

Give the orbital configuration of the phosphorus (p) atom.