2. Unknown Gas #4(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 VVW 2 3 45 6 7 Line 1: nm Line 2: nm Line 3: nm Line 4: nm Line 5: nm Line 6: nm Line 7: nm