Halogens electron configurations

The electronic configuration of each halogen is one electron less than that of a noble gas, and it is not surprising therefore, that all the halogens can accept electrons to form X" ions. Indeed, the reactions X(g) + e - X (g), are all exothermic and the values (see Table 11.1), though small relative to the ionisation energies, are all larger than the electron affinity of any other atom. 

Bromine [7726-95-6] Bi2, is the only nonmetallic element that is aUquid at standard conditions. Bromine [10097-32-2] Br, has at no. 35, at wt 79.904, and belongs to Group 17 (VIIA) of the Periodic Table, the halogens. Its electronic configuration is. The element s known isotopes... 

Table 19-1 shows the electron configurations of the halogens, using the symbols introduced in... 

Hall, C. M., 96, 373 Halogens atom models, 98 bond energies, 355 chemistry, 98 color, 352 covalent bonds, 97 covalent radius, 355 electron configuration, 352 ionization energies, 353 oxyacids, 358... 

In contrast, the halogens and noble gases on the right of this block are distinctly nonmetallic. The noble gases, Group 18 of the periodic table, are monatomic gases that resist chemical attack because their electron configurations contain completely filled s and p orbitals. 

From the above results, it seems that halogen substitution at one carbene center does not suffice to change the ground-state electronic configuration. Obviously, there is a better chance to achieve this if two carbene centers are substituted at the same time. In this respect, the reports on 22 and 27 (halogenated derivatives of 8) are significant. 

Nicolaides, A. Enyo, T. Miura, D. Tomioka, H. p-Phenylenecarbenonitrene and Its Halogen Derivatives How Does Resonance Interaction between a Nitrene and a Carbene Center Affect the Overall Electronic Configuration J. Am. Chem. Soc. 2001, i23, 2628-2636. 

Symbol Br atomic number 35 atomic weight 79.904 a halogen group element electron affinity 3.36359 eV electronegativity 2.8 electron configuration [Ar] 3di°4s24p5 most stable valence states -1 and -i-5, less stable valence states -1-1 and -i-3 a diatomic molecule (Br2) in liquid and vapor states over a wide range of temperature two stable isotopes, Br-79 (50.57%) and Br-81 (49.43%). 

Indicate the position of the halogens in Mendeleev s periodic table, their electron configurations, the size of their atoms, and the exhibited oxidation states. Write the electron configurations of the halogen molecules. How does the binding energy change in them ... 

A large number of halogen carbonyls has been prepared some of them have not the 18-electron configuration in PtCl2(CO)2, for example, there are only sixteen electrons. The carbonyls always have eighteen electrons, but the number of ligands is variable. It is therefore doubtful that they have d2sp3 hybridization. 

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