Concept explainers
(a)
Interpretation:
The resonance structures with an octet about the central atom and a resonance structure that has minimum formal charges for the following structure has to be determined.
Concept Introduction:
A covalent bond is a bond that is formed from the mutual sharing of electrons between atoms. Lewis structures are representations of the covalent bond. In this, Lewis symbols show how the valence electrons are present in the molecule.
Steps to write Lewis structures are as follows:
1. The skeleton structure with single bonds between all bonded atoms has to be written
2. Sum the valence electrons of the atoms in the molecule.
(a) For cations, one electron is subtracted for each positive charge.
(b) For anions, one electron is added for each negative charge.
3. Subtract two electrons from total number of valence electrons for each bond in the skeleton structure.
4. Count the number of electrons required to satisfy the octet rule for each atom in the structure. If the number of electrons needed is less than the number remaining, add one bond for every two electrons needed between atoms to attain an octet.
5. The remaining electrons are placed as lone pairs on atoms that need them to satisfy the octet rule.
The formula to calculate formal charge of atom is,
Some molecules do not have only one Lewis structure. The Lewis structures that differ only in the arrangement of multiple bonds are called resonance structures.
Resonance structure comprises of two or more Lewis Structures that describes the arrangement of bond of a single species and include fractional bonds and fractional charges.
(b)
Interpretation:
The resonance structures with an octet about the central atom and a resonance structure that has minimum formal charges for the following structure has to be determined.
Concept introduction:
Refer to part (a)
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Chemistry: Principles and Practice
- Using just a periodic table (not a table of electronegativities), decide which of these is likely to be the most polar bond. Explain your answer! (a) C-F (b) S-F (c) Si-F (d) O-Farrow_forward(a) -x- (b) Identify the main group that the element X belongs to in each of the following Lewis structures. For the types of molecule shown. -x-öarrow_forwardKeeping the same atomic connections and moving only electrons, write a more stable Lewis structure for each of the following. Be sure to specify formal charges, if any, in the new structure. (g) (h) (i)arrow_forward
- (a) Draw the two resonance structures of the molecule below (ignore structures that violate the octet rule): (b) For the above question, indicate which resonance structure (either the one given, or one that you drew) would be the most significant for this compound. Briefly state the reason for your choice.arrow_forwardFinish the following questions. ((a) Draw all of the possible Lewis structures (including reasonance structures) of the following compounds.(b) Label the formal charge for each atom.(c) Determine which resonance structure(s) is(are) the better/best and briefly explain. ClO2F2+arrow_forwardThe molecular ion S3N, has the cyclic structure 'N All S-N bonds are equivalent. (a) Give six equivalent resonance hybrid Lewis diagrams for this molecular ion. (b) Compute the formal charges on all atoms in the molecular ion in each of the six Lewis diagrams. (c) Determine the charge on each atom in the polyatomic ion, assuming that the true distribution of electrons is the average of the six Lewis diagrams arrived at in parts (a) and (b). (d) An advanced calculation suggests that the actual charge resident on each N atom is –0.375 and on each S atom is +0.041. Show that this result is consis- tent with the overall +1 charge on the molecular ion. Z-Sarrow_forward
- The structure shown below is missing formal charges, but all electrons are shown. What is the formal charge on (A) the oxygen atom (B) the nitrogen atom and (C) the carbon atom that is double-bonded to the nitrogen ? N.arrow_forwardDraw Lewis diagrams for the following ions. In the formula the symbol of the central atom is given first. (Hint:The valence octet may be expanded for the central atom.)(a) BrO4 - (b) PCl6 - (c) XeF6+arrow_forwardWrite the Lewis structure for each molecule.(a) C2H2(b) C2H4(c) N2H2(d) N2H4arrow_forward
- (a) Determine the formal charge of oxygen in the following structure. If the atom is formally neutral, indicate a charge of zero. (b) Draw an alternative Lewis (resonance) structure for the compound given in part (a). Show the unshared pairs and nonzero formal charges in your structure. Don't use radicals. Formal charge on O 0arrow_forwardQuestion attachedarrow_forwardDraw Lewis electron dot diagrams for the following species, indicating formal charges and resonance diagramswhere applicable.(a) HNC (central N atom)(b) SCN- (thiocyanate ion)(c) H2CNN (the first N atom is bonded to the carbon andthe second N)arrow_forward