How do the chemical properties of the halogens compare to those of the noble gases?

which pair of rays would be part of a ray diagram showing reflection? - a & b which pair of rays would be part of a ray diagram showing refraction? c & a

Remember, the density of water is 1g/cm3, so the mass of water equals the volume of the rose quartz. find the density of the rose quartz. find the specific gravity of the rose quartz. specific gravity = density of of water. what are the units for specific gravity?

Asatellite orbits earth in a circular orbit. does earth's gravity do work on the satellite? explain.