The species with the lowest Valence Electron (VE) count is :
[AuCl4]–
Using the ionic model, the valence electron count = d electrons of the metal ion + 2 electrons from each donor atom (each neutral 2-electron ligand, each halide and each end of a chelate).
[V(CO)6]–: V(–I) is d6; six CO give 12 electrons, so VE = 6 + 12 = 18.
[Cu(MA3)6]2+: Cu(II) is d9; six neutral monodentate donors give 12 electrons, so VE = 9 + 12 = 21.
[AuCl4]–: Au(III) is d8; four chloride donors give 8 electrons, so VE = 8 + 8 = 16, the usual count for a square-planar d8 complex.
[Zn(en)3]2+: Zn(II) is d10; three en ligands give six N donors and 12 electrons, so VE = 10 + 12 = 22.
Check: by the neutral (covalent) method for the gold complex, Au contributes 11, four Cl radicals 4 and the negative charge 1, giving 11 + 4 + 1 = 16, the same as the ionic count. So the order is 16 < 18 < 21 < 22.
Hence, [AuCl4]–.
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
