Allred-Rochow

Covalent radii and electronegativity values from Ref. 10. AEN is the difference in electronegativity between the two elements using the Allred-Rochow scale. 

Covalent radii and electronegativity values (Allred-Rochow) are abstracted from Huheey, J. E. Keiter, E. A. Keiter R. L. Inorganic Chemistry, 4th ed. Harper Row New York, 1993 pp. 187 and 292. 

Covalent Radii and Electronegativities (Allred-Rochow) of Carbon s First-Row Neighbors in the Periodic Table... 

In this equation, Z is the effective nuclear charge, which takes into account the fact that an outer electron is screened from experiencing the effect of the actual nuclear charge by the electrons that are closer to the nucleus (see Section 2.4). In principle, the Allred-Rochow electronegativity scale is based on the electrostatic interaction between valence shell electrons and the nucleus. 

Table 3.9. A comparison of Pauling (xa

Figure 3.17 Electronegativities xA for elements of groups 13-17, comparing natural values (circles, solid lines) with Pauling (triangles, dashed lines) and Allred-Rochow (squares, dotted lines) values.

Figure 3. fi-SCS(X) in 2-substituted adamantanes 25 plotted against Allred-Rochow electronegativities (X). 

A number of useful properties of the Group 1 elements (alkali metals) are given in Table 8. They include ionization potentials and electron affinities Pauling, Allred-Rochow and Allen electronegativities ionic, covalent and van der Waals radii v steric parameters and polarizabilities. It should be noted that the ionic radii, ri, are a linear function of the molar volumes, Vm, and the a values. If they are used as parameters, they cannot distinguish between polarizability and ionic size. 

Figure 5.20 Table of the binary hydrides and the Allred-Rochow electronegativity [26], Most elements react with hydrogen to form ionic, covalent or metallic binary hydrides.

Table 8. Allred-Rochow electronegativity and magnetic behavior of NiL4X complexes )...

Symbol Sb atomic number 51 atomic weight 121.75 Group VA (group 15) element atomic radius 1.41A ionic radius 86 + 0.76A covalent radius 1.21A electronic configuration [Kr] 4di°5s25p3 a metalloid element electronegativity 1.82 (Allred-Rochow type) valence states +5, +3, 0 and -3 isotopes and natural abundance Sb-121 (57.3%), Sb-123 (42.7%)... 

Symbol As atomic number 33 atomic weight 74.922 covalent radius AsS+ 1.2 lA electron configuration [Ar] 4s23di°4p3 a Group VA (Group 15) metalloid element electronegativity 2.20 (Allred-Rochow type) principal valence states, -1-5, +3, 0, and -3 stable isotope As-75. 

Figure 1.7 The Allred-Rochow electronegativity coefficients of the main group elements of the 2nd, 3rd, 4th and 5th periods...

Table 5.6 Bond length and bond angle data for some compounds with the formula EL,. The differences between the electronegativity coefficients (Allred-Rochow) of the elements are also given...

The first element, hydrogen, has an Allred Rochow electronegativity coefficient of 2.1, and an electronic configuration Is1. The atom may lose the single electron to become a proton, which exists in aqueous solutions as the hydroxonium ion, H30+(aq), in which the proton is covalently bonded to the oxygen atom of a water molecule. The ion is hydrated, as is discussed extensively in Chapter 2. The reduction of the hydrated proton by an electron forms the reference standard half-reaction for the scale of reduction potentials ... 

The very negative Ln t + /Ln potentials are consistent with the electropositive nature of the lanthanide elements their Allred-Rochow electronegativity coefficients are all 1.1 except for europium, which has a value of 1.0. The lighter elements of Group 3, Sc and Y, both have electronegativity coefficients of 1.3. The nearest p-block element to the lanthanides in these properties is magnesium (Mg2+/Mg) = -2.37 V, and its electronegativity coefficient is 1.2. 

Element Pauling Allred-Rochow Sanderson Hargittai-Bliefelt... 

Element Pauling 4 Sanderson X Allred- Rochow Xttv1 Allen X p Orbital hybrid Pauling scale Volts b Volfs/ electron... 

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