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 Since the boundary is not a well-defined physical entity, there are various non-equivalent definitions of atomic radius. In the case of Argon the atomic radius is 0.88 Å.There are cool facts about Argon that most don't know about. It is measured or calculated in different ways, so values vary from source to source. The atomic radius of Argon atom is 106pm (covalent radius). Here are a few diverse ones: Calculated Atomic Radii (pm). The graph shows how atomic radius varies across period 3: 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? Using Slater's Rules, we could calculate #Z_(eff)# as follows: All atoms have a (theoretical) atomic radius, even Argon. argon: Ar: 18: 0.095: Atomic radius is the distance from the centre of the nucleus to the edge of the surrounding electron cloud. Description of trend. Atomic radius of K+ vs. Argon Thread starter assaftolko; Start date Nov 21, 2012; Nov 21, 2012 #1 assaftolko. Ok, so what is the atomic radius of an atom of Ar? 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. Generally the argument is the increased effective nuclear charge #Z_(eff)# as the number of electrons increases.. This trend states that across the period (left --> right) atomic size decreases. 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 ? It is colorless, odorless and extremely unreactive. I see many images online where argon's atomic radius is smaller than that of chlorine. Sodium has a bigger atomic radius than Argon. It is, however, not completely inert - photolysis of hydrogen fluoride in a solid argon matrix at 7.5 kelvin yields argon … Covalent vs. Atomic Radius (pm). There is a general trend for atomic radius as you go from the left to the right of period 3. Argon is a chemical element with symbol Ar and atomic number 18. The atomic radius of a chemical element is the distance from the centre of the nucleus to the outermost shell of an electron. It must be noted, atoms lack a well-defined outer boundary. Argon is a noble gas. 171 0. Hence argon’s atomic size is lesser than of sodium. 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