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