An atom has 18 protons and 8 valance electrons. Which statement would best identify this elementa A. The element is highly reactive with eight electrons in its outer shell. B. The element has an atomic mass of 18. C. The element is "happy" or stable because it outer energylevel is filled. D. The element is a metal.

Compare and contrast the bohr model and the electron cloud models of the atom.

What metric units would you use to measure the thickness of a key

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.