The hatchet state have the right to be characterized as a set of conditionsthat describe a human or thing at a given time. It is in thissense of the word that researchers divide matter right into the 3 statesshown in the number below.




You are watching: An element that is a gas at room temperature

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The three claims of matter have characteristic properties. Solids have actually a distinct shape. Once they melt, the resulting fluid conforms come the form of the container. Gases increase to to fill their containers.

There are two reasons for studying gases before liquids orsolids. First, the behavior of gases is much easier to describebecause most of the nature of gases do not count on theidentity that the gas. We can as such develop a version for a gaswithout worrying about whether the gas is O2, N2,H2, or a mixture of these gases. Second, a relativelysimple, however powerful, model known as the kinetic moleculartheory is available, which explains most that the behavior ofgases.

Elements orcompounds that are Gases at Room Temperature

Before assessing the lifwynnfoundation.orgical and physical properties ofgases, it can be beneficial to ask: What kinds of aspects orcompounds room gases in ~ room temperature? To aid answer thisquestion, a perform of some typical compounds that space gases at roomtemperature is provided in the table below.

Common Gases at Room Temperature




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Element or compound Atomic or Molecular weight
H2 (hydrogen) 2.02
He (helium) 4.00
CH4 (methane) 16.04
NH3 (ammonia) 17.03
Ne (neon) 20.18
HCN (hydrogen cyanide) 27.03
CO (carbon monoxide) 28.01
N2 (nitrogen) 28.01
NO (nitrogen oxide) 30.01
C2H6 (ethane) 30.07
O2 (oxygen) 32.00
PH3 (phosphine) 34.00
H2S (hydrogen sulfide) 34.08
HCl (hydrogen chloride) 36.46
F2 (fluorine) 38.00
Ar (argon) 39.95
CO2 (carbon dioxide) 44.01
N2O (dinitrogen oxide) 44.01
C3H8 (propane) 44.10
NO2 (nitrogen dioxide) 46.01
O3 (ozone) 48.00
C4H10 (butane) 58.12
SO2 (sulfur dioxide) 64.06
BF3 (boron trifluoride) 67.80
Cl2 (chlorine) 70.91
Kr (krypton) 83.80
CF2Cl2 (dichlorodifluoromethane) 120.91
SF6 (sulfur hexafluoride) 146.05
Xe (xenon) 131.30

There are several patterns in the table above.

usual gases at room temperature incorporate both elements (such as H2 and also O2) and compounds (such together CO2 and NH3). elements that space gases in ~ room temperature are all nonmetals (such together He, Ar, N2, O2, and also so on). Link that room gases at room temperature are all covalent compounds (such together CO2, SO2, and also NH3) the contain 2 or an ext nonmetals. With only rare exception, this gases have reasonably small molecular weights.

As a general rule, compounds that consist of relatively light,covalent molecules room most likely to be gases in ~ roomtemperature.