11. Bonding & Molecular Structure

Formal Charge

11. Bonding & Molecular Structure

# Formal Charge - Video Tutorials & Practice Problems

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**Formal Charge** is the charge given to an element within a molecule when assuming equal sharing of electrons between bonded elements.

Formal Charge

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concept

## Formal Charge

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**Net Charge** is the sum of individual formal charges within a compound.

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example

## Formal Charge Example 1

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Problem

ProblemCalculate the formal charges for each of the oxygen atoms within the nitrite ion, NO_{2}^{–}.

A

0, -1

B

+1, 0

C

-1, -1

D

+1, +1

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Problem

ProblemCalculate the formal charge of the carbon atom within a carbon monoxide molecule.

a) –1

b) +2

c) 0

d) +

e) –2

A

–1

B

+2

C

0

D

+1

E

–2

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Problem

ProblemBased on calculated formal charges, determine the overall charge (net charge) for the following compound.

a) –3

b) +4

c) +1

d) –1

e) +2

A

–3

B

+4

C

+1

D

–1

E

+2

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Problem

ProblemWhich element within the thiocyanate ion possesses a negative charge?

a) C

b) S

c) N

d) All of them

e) None of them

A

C

B

S

C

N

D

All of them.

E

None of them.

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PRACTICE PROBLEMS AND ACTIVITIES (12)

- In the Lewis structure shown here, A, D, E, Q, X, and Z represent elements in the first two rows of the perio...
- Consider the Lewis structure for the polyatomic oxyanion shown here, where X is an element from the third per...
- Which is the best electron-dot structure for the thiosulfate ion (S2O3 2-) based on the rules of formal charge...
- Which one of these statements about formal charge is true? (a) Formal charge is the same as oxidation number. ...
- In the vapor phase, BeCl2 exists as a discrete molecule. (c) On the basis of the formal charges, which Lewis s...
- Consider the Lewis structure shown below. (a) Does the Lewis structure depict a neutral molecule or an ion? I...
- Use formal charges to identify the better Lewis structure.
- In N2O, nitrogen is the central atom and the oxygen atom is terminal. In OF2, however, oxygen is the central a...
- What are the formal charges of the atoms shown in red?
- What are the formal charges of the atoms shown in red?
- The following three Lewis structures can be drawn for N2O: (a) Using formal charges, which of these three res...
- Calculate the formal charge on the chlorine (cl) atom.