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3.2.1: Lewis Dot Diagrams (Problems)

  • Page ID
    235755
  • PROBLEM \(\PageIndex{1}\)

    Write the Lewis symbols for each of the following ions:

    1. As3–
    2. I
    3. Be2+
    4. O2–
    5. Ga3+
    6. Li+
    7. N3–
    Answer a

    eight electrons:

    CNX_Chem_07_03_Question1a_img.jpg
    Answer b

    eight electrons:

    CNX_Chem_07_03_Question1b_img.jpg

    Answer c

    no electrons

    Be2+

    Answer d

    eight electrons:

    CNX_Chem_07_03_Question1d_img.jpg

    Answer e

    no electrons

    Ga3+

    Answer f

    no electrons

    Li+

    Answer g

    eight electrons:

    CNX_Chem_07_03_Question1g_img.jpg

     

    PROBLEM \(\PageIndex{2}\)

    Write the Lewis symbols for the following elements:

    1. Cl
    2. Na
    3. Mg
    4. Ca
    5. K
    6. Br
    7. Sr
    8. F
    Answer a

    Screen Shot 2018-12-31 at 1.46.53 PM.png

    Answer b

    Screen Shot 2018-12-31 at 1.46.58 PM.png

    Answer c

    Screen Shot 2018-12-31 at 1.47.05 PM.png

    Answer d

    Screen Shot 2018-12-31 at 1.47.02 PM.png

    Answer e

    Screen Shot 2018-12-31 at 1.47.08 PM.png

    Answer f

    Screen Shot 2018-12-31 at 1.47.12 PM.png

    Answer g

    Screen Shot 2018-12-31 at 1.47.19 PM.png

    Answer h

    Screen Shot 2018-12-31 at 1.47.15 PM.png

    PROBLEM \(\PageIndex{3}\)

    Write the Lewis symbols of the ions in each of the following ionic compounds and the Lewis symbols of the atom from which they are formed:

    a. MgS
    b. Al2O3
    c. GaCl3
    d. K2O
    e. Li3N
    f. KF

    Answer a

    Two Lewis structures are shown. The left shows the symbol M g with a superscripted two positive sign while the right shows the symbol S surrounded by eight dots and a superscripted two negative sign.

    Answer b

    Two Lewis structures are shown. The left shows the symbol A l with a superscripted three positive sign while the right shows the symbol O surrounded by eight dots and a superscripted two negative sign.

    Answer c

    Two Lewis structures are shown. The left shows the symbol G a with a superscripted three positive sign while the right shows the symbol C l surrounded by eight dots and a superscripted negative sign.

    Answer d

    Two Lewis structures are shown. The left shows the symbol K with a superscripted positive sign while the right shows the symbol O surrounded by eight dots and a superscripted two negative sign.

    Answer e

    Two Lewis structures are shown. The left shows the symbol L i with a superscripted positive sign while the right shows the symbol N surrounded by eight dots and a superscripted three negative sign.

    Answer f

    Two Lewis structures are shown. The left shows the symbol K with a superscripted positive sign while the right shows the symbol F surrounded by eight dots and a superscripted negative sign.

    PROBLEM \(\PageIndex{4}\)

    In the Lewis structures listed here, M and X represent various elements in the third period of the periodic table. Write the formula of each compound using the chemical symbols of each element:

    (a)

     

    Two Lewis structures are shown side-by-side, each surrounded by brackets. The left structure shows the symbol M with a superscripted two positive sign. The right shows the symbol X surrounded by four lone pairs of electrons with a superscripted two negative sign outside of the brackets.

     

    (b)

     

    Two Lewis structures are shown side-by-side, each surrounded by brackets. The left structure shows the symbol M with a superscripted three positive sign. The right structure shows the symbol X surrounded by four lone pairs of electrons with a superscripted negative sign and a subscripted three both outside of the brackets.

     

    (c)

     

    Two Lewis structures are shown side-by-side, each surrounded by brackets. The left structure shows the symbol M with a superscripted positive sign and a subscripted two outside of the brackets. The right structure shows the symbol X surrounded by four lone pairs of electrons with a superscripted two negative sign outside of the brackets.

     

    (d)

     

    Two Lewis structures are shown side-by-side, each surrounded by brackets. The left structure shows the symbol M with a superscripted three positive sign and a subscripted two outside of the brackets. The right structure shows the symbol X surrounded by four lone pairs of electrons with a superscripted two negative sign and subscripted three both outside of the brackets.

    Answer a

    MgS

    Answer b

    AlCl3

    Answer c

    Na2S

    Answer d

    Al2S3

    PROBLEM \(\PageIndex{5}\)

    Identify the atoms that correspond to each of the following electron configurations.

    a. 1s22s22p5
    b. 1s22s22p63s2
    c. 1s22s22p63s23p64s23d104p4
    d. 1s22s22p63s23p64s23d104p1

    Answer a

    F

    Answer b

    Mg

    Answer c

    Se

    Answer d

    Ga

     

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