The term state have the right to be characterized as a collection of conditionsthat describe a human being or point at a provided time. It is in thissense of words that scientists divide matter into the 3 statesshown in the figure below.




You are watching: Which elements are all gases at room temperature

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The three says of matter have characteristic properties. Solids have a distinctive shape. When they melt, the resulting fluid conforms come the shape of the container. Gases increase to fill their containers.

There room two factors for researching gases before liquids orsolids. First, the behavior of gases is simpler to describebecause most of the properties of gases carry out not count on theidentity of the gas. We can as such develop a model for a gaswithout worrying around whether the gas is O2, N2,H2, or a mixture of this gases. Second, a relativelysimple, however powerful, model known as the kinetic moleculartheory is available, which defines most the the behavior ofgases.

Elements orcompounds that are Gases at Room Temperature

Before analyzing the keolistravelservices.comical and also physical properties ofgases, it could be useful to ask: What kinds of facets orcompounds space gases at room temperature? To aid answer thisquestion, a list of some common compounds that space gases in ~ roomtemperature is offered in the table below.

Common Gases in ~ 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 number of patterns in the table above.

common gases in ~ room temperature incorporate both aspects (such together H2 and O2) and compounds (such together CO2 and also NH3). aspects that are gases at room temperature room all nonmetals (such together He, Ar, N2, O2, and also so on). Compound that room gases at room temperature space all covalent compounds (such as CO2, SO2, and NH3) that contain 2 or much more nonmetals. With just rare exception, this gases have relatively small molecular weights.

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