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2001 (1)
2000 (1)
1Author    Martin Trömel, Sven HübnerRequires cookie*
 Title    Atomvolumen, Atomabstände und chemische Bindung in festen metallischen Elementen Atomic Volume, Atomic Distances and Chemical Bonding in Solid Metallic Elements  
 Abstract    Relationships between bond lengths and bond numbers and also between atomic volumes and valencies are derived and parameters for their calculation are given for the s-block, p-block, and d-block metals. From the atomic volumes under pressure, the valencies of three solid lanthanoids have been confirmed or redetermined: La 3: Ce 2. 3. and 4: Yb 2 and 3. 
  Reference    Z. Naturforsch. 56b, 364—368 (2001); eingegangen am 15. Dezember 2000 
  Published    2001 
  Keywords    Atomic Volume, Valences, Metallic Elements 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0364.pdf 
 Identifier    ZNB-2001-56b-0364 
 Volume    56 
2Author    M. Etallic, R. Adii, Ionic Radii, Valences, F. Solid, M. Etallic, Elem Ents, M. Artin, Tröm El, HerrnRequires cookie*
 Title    Metallradien, Ionenradien und Wertigkeiten fester metallischer Elemente  
 Abstract    Metallic radii rm are correlated with the ionic radii r, by linear relationships. For groups 1 up to 7 as well as for AI, Ga, In, Tl, Sn, and Pb the ionic radii refer to the maximum valences (oxidation states) as known from compounds according to rm « 1.16 • (r, + 0.64) [A], For groups 8 up to 12, rm « 0.48 • (rs + 2.26) [A] with valences W = 14 -G (G = group number). These valences are considered regular (Wr). For groups 1 up to 12, they obey the equation Wr = 7 -IG -71. According to this equation all outer s electrons and the unpaired d electrons should be involved in chemical bonding, i.e. in the cohesion of the element in the solid state. From the melting temperatures and the atomic volumes it is concluded, however, that only 19 out of the 30 d-block elements have regular valences, namely the elements of groups 3, 5, 6, 10, 11 as well as Os, Ir, Zn, Cd, and possibly Ru. All of the non-regular valences are lower than the regular ones. Four of them are integers: Mn 3; Fe, Co 4; Re 6. M etallradien 
  Reference    Z. Naturforsch. 55b, 243—247 (2000); eingegangen am 2. Dezember 1999 
  Published    2000 
  Keywords    Metallic Radii, Ionic Radii, Metallic Valence, Atomic Volume 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0243.pdf 
 Identifier    ZNB-2000-55b-0243 
 Volume    55