Home Element Group 18 elements

Group 18 elements

    What are Group 18 Elements Called?

    Group 18 elements also called noble gases or inert gases are the seven chemical elements of the periodic table with a closed-shell electronic configuration. The Group-18 elements like helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og) are colorless, orderless, monoatomic gases with very low melting point and boiling point.

    Properties of Noble Gases

    Properties Group 18 Elements (Noble Gases)
    Helium Neon Argon Krypton Xenon Radon Oganesson
    Discovered by Sir William Ramsay in London, and independently by Per Teodor Cleve and Nils Abraham Langlet in Sweden (1995) Sir William Ramsay and Morris Travers (1898) Lord Rayleigh and Sir William Ramsay (1894) Sir William Ramsay and Morris Travers (1898) Sir William Ramsay and Morris Travers (1898) Friedrich Ernst Dorn (1900) Scientists from the Joint Institute for Nuclear Research in Dubna, Russia, and the Lawrence Livermore National Laboratory in California, USA (2006)
    Atomic number 2 10 18 36 54 86 118
    Relative atomic mass 4.003 20.180 39.95 83.798 131.293 [222] [294]
    Electron per shell 2 2, 8 2, 8, 8 2, 8, 18, 8 2, 8, 18, 18, 8 2, 8, 18, 32, 18, 8 2, 8, 18, 32, 32, 18, 8 (predicted)
    Electron configuration 1s2 [He] 2s2 2p6 [Ne] 3s2 3p6 [Ar] 3d10 4s2 4p6 [Kr] 4d10 5s2 5p6 [Xe] 4f14 5d10 6s2 6p6 [Rn] 5f14 6d10 7s2 7p6 (predicted)
    State at 20°C Gas Gas Gas Gas Gas Gas Solid
    Melting point (°C) Unknown −248.59 −189.34 −157.37 −111.75 −71 Unknown
    Boiling point (°C) −268.928 −246.046 −185.848 −153.415 −108.099 −61.7 Unknown
    Density (gm cm−3) 0.000164 0.000825 0.001633 0.003425 0.005366 0.009074 Unknown
    non-bonded atomic radius (Ã…) 1.40 1.54 1.88 2.02 2.16 2.20 Unknown
    Covalent radius (Ã…) 0.37 0.62 1.01 1.16 1.36 1.46 1.57
    First ionization energy (kJ mol−1) 2372.322 2080.662 1520.571 1350.757 1170.352 1037.073 860
    Electron affinity (kJ mol−1) Not stable Not stable Not stable Not stable Not stable Not Stable 5.403
    Pauling Electronegativity Unknown Unknown Unknown Unknown 2.60 Unknown Unknown
    Oxidation number 0 0 0 2 6, 4, 2 2 −1, 0, +1, +2, +4), +6 (predicted)
    Crystal structure ​hexagonal close-packed (hcp) face-centered cubic (fcc) face-centered cubic (fcc) face-centered cubic (fcc) face-centered cubic (fcc) face-centered cubic (fcc) face-centered cubic (fcc)
    CAS number 7440-59-7 7440-01-9 7440-37-1 7439-90-9 7440-63-3 10043-92-2 54144-19-3
    ChemSpider ID 22423 22377 22407 5223 22427 22240 Unknown

    Noble Gases in Periodic Table

    Group 18 elements in the periodic table

    Due to lack of reactivity, they are also called inert gas. The properties, occurrences, compounds, and uses of Group-18 elements are derived below the individual topics in learning chemistry.

    Radon element symbol properties, facts, discovery, isotopes, occurrence and position in periodic table

    Radon

    Radon Element Radon is a chemical element or noble gas or Group 18 element of the periodic table with the symbol Rn and atomic number 86....
    Xenon chemical element or noble gas uses, facts, discovery, properties, isotopes and position on periodic table

    Xenon

    What is Xenon? Xenon is a chemical element or inert or noble gas of Group 18 of the periodic table with the symbol Xe and atomic...
    Krypton (Kr), chemical element or noble gas of Group 18 of periodic table with properties, compounds, fluorescent lamps uses

    Krypton

    What is Krypton? Krypton is a chemical element, inert gas, or noble gas of Group 18 of the periodic table with the symbol Kr and atomic...
    Argon (Ar), chemical element, noble gas of Group 18 of periodic table with properties, uses in metallurgy or fluorescent tube

    Argon

     What is Argon? Argon is a chemical element or inert or noble gas of Group 18 of the periodic table with the symbol Ar and atomic number...
    Neon, chemical element symbol, periodic table properties, and atomic model

    Neon

    Neon on the Periodic Table Neon (symbol Ne), a chemical element, inert gas, or noble gas of Group-18 of the periodic table discovered through its...
    Helium element symbol, periodic table properties, and atomic model

    Helium

    What is helium? Helium is a noble gas or group-18 element of the periodic table with the chemical symbol He and atomic number 2. It is the second...
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