CO,, and are isoelectronic because each has two nuclei and 10 valence electrons, with each atom considered to have 5 of them ( a lone-pair and a triple-bond ).
42.
Both In 4 Se 3 and In 4 Te 3 are similar black crystalline solids and have been formulated to contain a non linear In 3 5 + unit that is isoelectronic with Hg 3 2 +.
43.
These ideas were further developed to become the "'Zintl rule "'or "'Zintl Klemm concept "', where the polyanion structure should be similar to an isoelectronic element.
44.
Isoelectronic species can be expected to show useful consistency and predictability in their properties . ( Slight differences of, for example, structural formula, such as a double versus single bond, commonly have major effects .)
45.
TlI 3 is no exception as it is possible to stabilise thallium ( III ) with excess I & minus; forming the TlI 4 & minus; ion ( isoelectronic with the tetraiodomercurate anion and with lead ( IV ) iodide ).
46.
Sulfoximides ( also called sulfoximines ) are tetracoordinate sulfur nitrogen compounds, isoelectronic with sulfones, in which one oxygen atom of the sulfone is replaced by a substituted nitrogen atom, e . g ., R 2 S ( O ) = NR2.
47.
Sulfonediimines ( also called sulfodiimines, sulfodiimides or sulfonediimides ) are tetracoordinate sulfur nitrogen compounds, isoelectronic with sulfones, in which both oxygen atoms of the sulfone are replaced by a substituted nitrogen atom, e . g ., R 2 S ( = NR2 ) 2.
48.
The phosphinimide ligand is isoelectronic with ligands such as OPR 3, [ OSiR 3 ] ", [ CSiR 3 ] 3 " and [ NSiR 3 ] 2 ", and often has remarkable similarities in structure and bonding to [ M ]-OSiR 3.
49.
Since N 2 is isoelectronic with carbon monoxide ( CO ) and acetylene ( C 2 H 2 ), the bonding in dinitrogen complexes is closely allied to that in carbonyl compounds, although N 2 is a weaker " ? "-donor and " ? "-acceptor than CO . Theoretical studies show that " ? " donation is a more important factor allowing the formation of the M N bond than " ? " back-donation, which mostly only weakens the N N bond, and end-on ( " ? " 1 ) donation is more readily accomplished than side-on ( " ? " 2 ) donation.
