Prompt 7 of 7
Name a gas found in Earth's atmosphere
201 accepted answers across 5 rarity tiers.
100 ptsOne in a Krillion2 answers
The rarest possible answer — almost no player finds it.
- Isoprene— Trees release it, and it makes the Blue Ridge haze.
- Sodium vapor— Astronomers fire lasers at this layer to make artificial guide stars.
85 ptsDeep Cut149 answers
Genuinely obscure. Most players never think of it.
- (Z)-3-hexen-1-ol
- Acetaldehyde
- Acetic acid
- Acetonitrile
- Atomic bromine
- Atomic chlorine
- Atomic hydrogen
- Atomic iodine
- Atomic nitrogen
- Atomic oxygen
- Beta-caryophyllene
- Bromine
- Bromine monoxide
- Bromochloromethane
- Bromoform
- Bromomethane
- Butadiene
- Calcium vapor
- Camphene
- Camphor
- Carbon disulfide
- Carbon tetrachloride
- Carbonyl sulfide
- Carene
- CFC-11
- CFC-112
- CFC-112a
- CFC-113
- CFC-113a
- CFC-114
- CFC-114a
- CFC-115
- CFC-12
- CFC-13
- Chlorine monoxide
- Chlorine nitrate
- Chloroiodomethane
- Chloromethane
- Diethyl ether
- Dimethyl disulfide
- Dimethyl sulfide
- Dimethylamine
- Dinitrogen pentoxide
- Ethanethiol
- Ethanol
- Ethyl acetate
- Ethyl iodide
- Ethylamine
- Ethylbenzene
- Eucalyptol
- Farnesene
- Formic acid
- Furan
- Glycolaldehyde
- Glyoxal
- Halon-1202
- Halon-1211
- Halon-1301
- Halon-2402
- HCFC-123
- HCFC-124
- HCFC-132b
- HCFC-133a
- HCFC-141b
- HCFC-142b
- HCFC-21
- HCFC-31
- Hexafluoroethane
- Hexane
- HFC-125
- HFC-143a
- HFC-152a
- HFC-227ea
- HFC-23
- HFC-236fa
- HFC-245fa
- HFC-32
- HFC-365mfc
- HFC-43-10mee
- HFO-1234yf
- HFO-1234ze
- HFOs
- Humulene
- Hydrogen bromide
- Hydrogen chloride
- Hydrogen fluoride
- Hydroperoxyl radical
- Hydroxyl radical
- Hypobromous acid
- Hypochlorous acid
- Hypoiodous acid
- Iodine monobromide
- Iodine monochloride
- Iodine monoxide
- Iodomethane
- Iron vapor
- Isobutane
- Isocyanic acid
- Isopentane
- Linalool
- Lithium vapor
- Longifolene
- Magnesium vapor
- Methacrolein
- Methanesulfonic acid
- Methanethiol
- Methyl chloroform
- Methyl ethyl ketone
- Methyl hydroperoxide
- Methyl vinyl ketone
- Methylamine
- Methylglyoxal
- Myrcene
- Nitrate radical
- Nitric acid vapor
- Nitrogen trifluoride
- Nitrous acid
- Nitryl chloride
- Nonane
- Ocimene
- Octafluorocyclobutane
- Octafluoropropane
- Pentane
- Perfluoro-N-methylmorpholine
- Perfluorobutane
- Perfluorohexane
- Perfluoropentane
- Perfluorotributylamine
- Perfluorotriethylamine
- Perfluorotripropylamine
- Peroxyacetyl nitrate
- Peroxynitric acid
- PFCs
- Phellandrene
- Potassium vapor
- Propyl iodide
- Propylene
- Sabinene
- Singlet oxygen
- Styrene
- Sulfur trioxide
- Sulfuric acid vapor
- Sulfuryl fluoride
- Terpinene
- Tetrafluoromethane
- Thujene
- Trifluoromethyl sulfur pentafluoride
- Trimethylamine
- Xylene
60 ptsRare37 answers
Uncommon — only a minority of players land here.
- Acetone
- Acetylene
- Ammonia
- Benzene
- Butane
- Chlorine
- Chloroform
- Ethane
- Ethylene
- Formaldehyde
- Halons
- HCFC-22
- HCFCs
- HFC-134a
- HFCs
- Hydrogen cyanide
- Hydrogen peroxide
- Hydrogen sulfide
- Iodine
- Isopropanol
- Krypton
- Limonene
- Mercury vapor
- Methanol
- Methyl tert-butyl ether
- Nitric oxide
- Nitrogen dioxide
- Phosgene
- Pinene
- Propane
- Radon
- Sulfur dioxide
- Sulfur hexafluoride
- Tetrachloroethylene
- Toluene
- Trichloroethylene
- Xenon
30 ptsSchooler10 answers
A solid, middling pick shared with plenty of other players.
- Argon
- Carbon monoxide
- CFCs
- Helium
- Hydrogen
- Methane
- Neon
- Nitrous oxide
- Ozone
- Water vapor
10 ptsPlankton3 answers
The most common answer on the board.
- Carbon dioxide
- Nitrogen
- Oxygen