Buzz·Posted on Apr 17, 2013The 13 Most Badass Periodic ElementsYou don't want to meet these mofos in a dark alley.by Jessica MisenerBuzzFeed StaffLinkFacebookPinterestTwitterMail 13. Iridium (Ir) - #77 12. Curium (Cm) - #96 11. Krypton (Kr) - #36 10. Francium (Fr) - #87 9. Chlorine (Cl) - #17 8. Helium (He) - #2 7. Bromine (Br) - #17 6. Carbon (C) - #6 5. Potassium (K) - #19 Tap to play GIF Tap to play GIF 4. Arsenic (As) - #33 3. Gold (Au) - #79 2. Mercury (Hg) - #80 1. Hydrogen (H) - #1