10. Unknown Gas #2(circle correct answer): Hydrogen, Helium, Mercury, Sodium, Neon, or Krypton 8000- 7000- 6000 - 5000 4000- 3000- 2000- 1000- -100 -50 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 Nanometers W VV 12 34 Line 1: nm Line 2: nm Range Line 3-4: nm Range Line 4-5: nm