Which of the following explains why elements in column 17 (the halogens) are very reactive? a. their atoms contain three energy levels.. b. their atoms need only one electron to complete their outer energy level.. c. their atoms have large masses.. d. their atoms contain the same number of protons as electrons..

What is driving behind plate tectonics (plate movment)? a) gravity only b) inertia c) convection and gravity d) the sun theres no option for science so i picked chemistry. plz

Which of these conditions most likely produces an unstable isotope?

Will give ! what are the advantages and disadvantages of nuclear power? check all that apply. one advantage of nuclear energy is that it does not produce carbon dioxide emissions. storage of nuclear waste is a short-term problem associated with nuclear energy. the problem with uranium mining is that a large quantity of uranium must be extracted to meet energy needs because the energy release from uranium fission is so low. safe operation of a nuclear power plant can be jeopardized by a human mistake.