Crossword Puzzle halogens & noble gasesOnline version halogens and noble gases by A Hoog 1 F = 2 Cl = 3 Kr = 4 Br = 5 I = 6 Xe = 7 He = 8 Rn = 9 Ne = 10 Ar = 2 8 7 3 4 1 6 10 5 9