your question has to be corrected. In the case of Argon the atomic radius is 0.88 Å.There are cool facts about Argon that most don't know about. Since the boundary is not a well-defined physical entity, there are various non-equivalent definitions of atomic radius. All atoms have a (theoretical) atomic radius, even Argon. The atomic radius of a chemical element is the distance from the centre of the nucleus to the outermost shell of an electron. Sodium has a bigger atomic radius than Argon. The graph shows how atomic radius varies across period 3: Argon is a noble gas. There is a general trend for atomic radius as you go from the left to the right of period 3. The atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. Description of trend. How is it that these two have the same electron level array (1s^22s^22p^63s^23p^6), but K+ has bigger radius than Ar? It is colorless, odorless and extremely unreactive. It is, however, not completely inert - photolysis of hydrogen fluoride in a solid argon matrix at 7.5 kelvin yields argon … Atomic radius, non-bonded ... Argon's name comes from the Greek word argos meaning lazy and indeed for more than a hundred years after its discovery chemists were unable to get it to combine with any other elements. Argon is a chemical element with symbol Ar and atomic number 18. Hence argon’s atomic size is lesser than of sodium. 171 0. 18: Argon - Argon [Ar] Group: 18 Period: 3 Atomic number: 18 Atomic mass: 39.948 Configuration: [Ne] 3s 2 3p 6 Atomic radius: 71 pm Covalent radius: 106 pm Electron affinity: 0 eV Ionization energy: 15.7596 eV Electronic term: 1 S 0 Mass fraction in the earth crust: 0.0000015 Mass fraction in the earth space: 0.0002 Electronegativity: 4.3 It is measured or calculated in different ways, so values vary from source to source. Atomic radius: 0.88 Å Ionic radius: -- Å Covalent radius: 0.98 Å Atomic volume: 23.9 cm³/mol Density (293 K): 0.0017824 g/cm³ Crystal structure: cubic face centered Isotopes Nuclide Why does Na have bigger atomic radius than Ar ? Calculated Atomic Radii (pm). It must be noted, atoms lack a well-defined outer boundary. Here are a few diverse ones: Calculated Atomic Radii (pm). Generally the argument is the increased effective nuclear charge #Z_(eff)# as the number of electrons increases.. I see many images online where argon's atomic radius is smaller than that of chlorine. Ok, so what is the atomic radius of an atom of Ar? argon: Ar: 18: 0.095: Atomic radius is the distance from the centre of the nucleus to the edge of the surrounding electron cloud. Classified as a noble gas, Argon is a gas at room temperature. Covalent vs. Atomic Radius (pm). This trend states that across the period (left --> right) atomic size decreases. 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