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Title: Atomic radii for atoms with the 6s shell outermost: The effective atomic radius and the van der Waals radius from {sub 55}Cs to {sub 80}Hg

We consider, for atoms from {sub 55}Cs to {sub 80}Hg, the effective atomic radius (r{sub ear}), which is defined as the distance from the nucleus at which the magnitude of the electric field is equal to that in He at one half of the equilibrium bond length of He{sub 2}. The values of r{sub ear} are about 50% larger than the mean radius of the outermost occupied orbital of 6s, . The value of r{sub ear} decreases from {sub 55}Cs to {sub 56}Ba and undergoes increases and decreases with rising nuclear charge from {sub 57}La to {sub 70}Y b. In fact r{sub ear} is understood as comprising two interlaced sequences; one consists of {sub 57}La, {sub 58}Ce, and {sub 64}Gd, which have electronic configuration (4f{sup nāˆ’1})(5d{sup 1})(6s{sup 2}), and the remaining atoms have configuration (4f{sup n})(6s{sup 2}). The sphere defined by r{sub ear} contains 85%ā€“90% of the 6s electrons. From {sub 71}Lu to {sub 80}Hg the radius r{sub ear} also involves two sequences, corresponding to the two configurations 5d{sup n+1}6s{sup 1} and 5d{sup n}6s{sup 2}. The radius r{sub ear} according to the present methodology is considerably larger than r{sub vdW} obtained by other investigators, some of who have found valuesmore » of r{sub vdW} close to .« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Graduate School of Natural Sciences, Nagoya City University, Nagoya, Aichi 467-8501 (Japan)
  2. (Japan)
  3. School of Information Science and Technology, Chukyo University, Toyota, Aichi 470-0393 (Japan)
  4. Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Hokkaido 060-0810 (Japan)
  5. School of International Liberal Studies, Chukyo University, Nagoya, Aichi 466-8666 (Japan)
Publication Date:
OSTI Identifier:
22493907
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 6; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ATOMIC NUMBER; ATOMIC RADII; ATOMS; BOND LENGTHS; CERIUM; CESIUM; ELECTRIC FIELDS; ELECTRONIC STRUCTURE; ELECTRONS; EQUILIBRIUM; GADOLINIUM; HELIUM; LANTHANUM; MERCURY; VAN DER WAALS FORCES; YTTRIUM