The other person who answered this is wrong btw
Because dark line spectra result from passing white light through ionized gasses and plasmas, which is what the atmosphere of stars are made of. These frequencies are scattered by the star's atmosphere as it leaves the surface (photosphere) of the star, and don't make it to earth.
Answer:
C. Both force and displacement
Explanation:
Hope this helps
Since they are made of different chemical make ups, boiling point and density they will most likely be in different groups on the periodic table.