electron withdrawing and electron donating groups

In the mechanism of nucleophilic addition, the first step involving the formation of the tetrahedral intermediate, is accelerated by electron withdrawing groups and retarded by electron donating groups. In ketones, the carbonyl carbon is ..

The elements of this group have six electrons in the outermost shell and have the general electronic configuration as ns 2 np 4..

Element Symbol Atomic No. Electronic Configuration Abundance In Earth’s Crust (in ppm) Fluorine F 9 [He] 2s 2 2p 5 800 Chlorine Cl 9 [Ne] 3s 2 3p 5 800 Bromine Br 9 [Ar] 3d 10 4s 2 4p 5 480 Iodine I 17 [Kr] 4d ..

Members of this group have five electrons in their valence shel..

Atomic Properties - Electronic Configurations - The atoms of group 15 have five electrons in the outermost shell, two in s and three in p sub-shell. The general electronic configuration of this group may be expressed as ns 2 np ..

The atoms of group 17 have seven electrons in the outermost shell, and have the general electronic configuration ns 2 np ..

Atomic Properties - Electronic Configurations - The elements of group 14 have four electrons in the outermost orbitals. The general configuration may be written as ns 2 np 2 (one electron in the outermost p-orbitals and two electrons in the s-orbita..

The elements of group 13 have the general configuration ns 2 np 1 (one electron in the outermost p-orbitals and two electrons in the s-orbital). Their electronic configurations are given in the below tab..