Thiocyanate is one of an isoelectronic series of anions that only differ in the terminal chalcogen atom (O, S, Se). The bonding in each of these species is generally the same, but we find that the details of the delocalization in the system differ. As shown on the right, the relative contributions of the chalcogen and the nitrogen differ on going from oxygen, to sulfur, and finally to selenium. Does this trend match what you would expect from Lewis theory and the concepts used by it? Briefly state why (or why not).
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
Polarity Of Water
In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
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![Question 8
Thiocyanate is one of an isoelectronic series of anions
that only differ in the terminal chalcogen atom (O, S, Se).
The bonding in each of these species is generally the (SECN]
same, but we find that the details of the delocalization in
the system differ. As shown on the right, the relative
contributions of the chalcogen and the nitrogen differ on
going from oxygen, to sulfur, and finally to selenium.
85% 15%
Does this trend match what you would expect from Lewis
theory and the concepts used by it? Briefly state why (or
why not).
(SCN)"
75%
25%
(OCN]
55%
45%](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe3d33fd8-5343-4941-b23c-387164053b77%2F6c64ccb8-b122-449c-89bc-437e14a3810f%2Fxix84u_processed.jpeg&w=3840&q=75)
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