The ax state deserve to be defined as a set of conditionsthat define a person or thing at a offered time. The is in thissense of the word that scientists divide matter into the three statesshown in the number below.




You are watching: Which elements are gases at room temperature

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

There room two factors for studying gases before liquids orsolids. First, the actions of gases is simpler to describebecause many of the nature of gases perform not rely on theidentity that the gas. Us can thus develop a design for a gaswithout worrying about whether the gas is O2, N2,H2, or a mixture of this gases. Second, a relativelysimple, however powerful, model recognized as the kinetic moleculartheory is available, which describes most of the behavior ofgases.

Elements orcompounds that are Gases at Room Temperature

Before evaluating the benidormclubdeportivo.orgical and also physical nature ofgases, it can be helpful to ask: What kinds of aspects orcompounds are gases in ~ room temperature? To help answer thisquestion, a perform of some common compounds that room gases at roomtemperature is given in the table below.

Common Gases in ~ Room Temperature




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Element or link 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 in ~ room temperature include both elements (such as H2 and also O2) and compounds (such as CO2 and NH3). aspects that are gases in ~ room temperature space all nonmetals (such together He, Ar, N2, O2, and so on). Compounds that are gases in ~ room temperature are all covalent compounds (such together CO2, SO2, and also NH3) the contain 2 or more nonmetals. With just rare exception, this gases have reasonably small molecular weights.

As a basic rule, compounds that consist of reasonably light,covalent molecules are most most likely to it is in gases in ~ roomtemperature.