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Homework: Structures of Molecular and
Ionic Compounds

Review

Answer the following questions using complete sentences.
  1. What kind of bond forms between metals and non-metals? Describe how this type of bond works to hold atoms together.
  2. What kind of bond forms between non-metals and non-metals? Describe how this type of bond works to hold atoms together.
  3. Rate your knowledge of the procedure to draw a Lewis diagram of a molecule on a scale of 1 - 7, where 7 means you have it completely mastered and 1 means you know nothing.
  4. Using your memory only, write out a step by step procedure for drawing the structure of a molecule given its molecular formula.
  5. Rate your knowledge of this procedure again on the same scale. How did your rating change? Why?
  6. Rate your knowledge of the procedure to determine the 3D shape of a molecule given its Lewis structure on a scale of 1 - 7, where 7 means you have it completely mastered and 1 means you know nothing.
  7. Using your memory only, write out a step by step procedure for figuring out the 3D shape of a molecule given its molecular formula.
  8. Rate your knowledge of this procedure again on the same scale. How did your rating change? Why?
  1. Rate your knowledge of the procedure to write the formula of an ionic compound given a metallic and a non-metallic element on a scale of 1 - 7, where 7 means you have it completely mastered and 1 means you know nothing.
  2. Using your memory only, write out a step by step procedure for predicting the charges of the ions formed by various elements and how to combine them to write a correct chemical formula for the ionic compound they would make together.
  3. Rate your knowledge of this procedure again on the same scale. How did your rating change? Why?
  4. For each element in the following table write the ion that it forms in compounds.
    ElementIonElementIon
    Li I 
    Be Ba 
    B P 
    N Al 
    O S 
    F Mg 
    Na Cl 


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Ionic Compounds

For each of the following pairs of elements write the formula of the ion formed by each element and the correct formula for an ionic compound formed from those elements.

  Metal    Metal Ion  Non-metalNon-metal IonFormula of Ionic Compound
Na   Cl    
Li   F    
K   I    
Mg   Cl    
Ca   F    
Na   O    
K   S    
Be   O    
Ba   Se    
Al   Cl    
Ga   F    
B   P    
Mg   N    
Ca   P    
Al   O    
B   S    


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Lewis Diagrams, Names, and 3-D Shapes

For each of the molecules below write the name, give the total number of valence electrons, draw a Lewis structure, and name the 3D shape of the molecule.

Hints: If the central atom is a metal it is certain to have fewer electrons in the correct molecule than an octet. If the central atom is C, N, O, or F then it must have an octet. Follow the octet rule for all atoms!

  1. CO
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  2. BF3
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  3. CH4 (methane)
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  4. NH3
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  5. O3 (ozone)
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  6. H2O
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  7. CO2
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  1. H2S
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  2. NO2– (nitrite)
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  3. O2
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  4. HCl
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  5. AlBr3
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  6. CCl2F2 (dichloro-difluoromethane)
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  7. NF3
    name:
    total valence electrons:
    structural drawing:

    3D shape:



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  1. ClO3– (chlorate)
    total valence electrons:
    structural drawing:

    3D shape:

  2. HCN (hydrogen cyanide)
    total valence electrons:
    structural drawing:

    3D shape:

  3. CH3OH (methanol: one H is connected to O)
    total valence electrons:
    structural drawing:

    3D shape:

  4. H3O+ (hydronium)
    total valence electrons:
    structural drawing:

    3D shape:

  5. OF2
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  6. BeCl2
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  7. CH2O (formaldehyde)
    total valence electrons:
    structural drawing:

    3D shape:

  8. SiH4
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  1. SO32– (sulfite)
    total valence electrons:
    structural drawing:

    3D shape:

  2. ClO2– (chlorite)
    total valence electrons:
    structural drawing:

    3D shape:

  3. H2O2 (hydrogen peroxide)
    total valence electrons:
    structural drawing:

    3D shape:

  4. CO32– (carbonate)
    total valence electrons:
    structural drawing:

    3D shape:

  5. NH4+ (ammonium)
    total valence electrons:
    structural drawing:

    3D shape:

  6. PO43– (phosphate)
    total valence electrons:
    structural drawing:

    3D shape:

  7. AsI3
    name:
    total valence electrons:
    structural drawing:

    3D shape:

  8. Cl2
    name:
    total valence electrons:
    structural drawing:

    3D shape:



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The names of some compounds are given below. For each one write the chemical formula, the total number of valence electrons, the Lewis structure, and the 3D shape.

  1. carbon tetrachloride
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  2. phosphorous trihydride
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  3. sulfur trioxide
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  4. sulfur dioxide
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  5. hydrogen monofluoride
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  6. germanium tetrabromide
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  7. nitrogen triiodide
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  1. oxygen dichloride
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  2. phosphorous trichloride
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  3. dioxygen difluoride
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  4. magnesium difluoride
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  5. aluminum trichloride
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  6. nitrogen
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

  7. iodine
    formula:
    total valence electrons:
    structural drawing:

    3D shape:

Solutions to the Molecular Names and Lewis Structures exercises
This homework belongs with the Chemical Nomenclature of Molecular Compounds group activity.
Activity: Lewis Diagrams
Lewis Diagrams Molecules to Draw
Homework: Lewis Diagrams Molecules
Lewis Diagrams with simple VSEPR shapes
Last updated: Jan 03, 2020       Home