Worksheet: Lewis Structures

In this worksheet, we will practice drawing Lewis structures of compounds from their names or formulas and counting the numbers of lone and valence electrons.

Q1:

Which of the following is the correct Lewis structure for O H ?

  • A
    O H
  • B
    O H
  • C
    O H
  • D
    O H
  • E
    O H

Q2:

Which of the following is the correct Lewis structure for I 3 ?

  • A
    I I I
  • B
    I I I
  • C
    I I I
  • D
    I I I
  • E
    I I I

Q3:

Which of the following is the correct Lewis structure for B ( O H ) 3 ?

  • A
    B O O O H H H
  • B
    B O O H H H O
  • C
    B O O O H H H
  • D
    B O O O H H H
  • E
    B H H H O O O

Q4:

Which one of the following is the correct Lewis structure of P H 3 ?

  • A
    P H H H
  • B
    P H H H
  • C
    P H H H
  • D
    P + H H H
  • E
    P H H H

Q5:

Which of the following is the correct Lewis structure for H C l ?

  • A
    H Cl
  • B
    H Cl
  • C
    H Cl
  • D
    H Cl
  • E
    H Cl

Q6:

Which of the following is the correct Lewis structure for S O 3 ?

  • A
    S O O O
  • B
    S O O O
  • C
    S O O O
  • D
    S O O O
  • E
    S O O O

Q7:

Nitrous oxide ( N O ) 2 , commonly known as laughing gas, is used as an anesthetic in minor surgeries, such as the routine extraction of wisdom teeth. Including lone pairs, give the structural formula of nitrous oxide.

  • A
    O N N
  • B
    N N O

Q8:

Which of the following is not a step taken when drawing out a Lewis structure?

  • APlace the leftover electrons on the central atom.
  • BProduce octets of electrons by rearranging the electrons to form multiple bonds.
  • CAdd electrons to the outside atoms.
  • DLine the atoms up according to their atomic masses.
  • ECount the valence electrons.

Q9:

Which of the following is the correct Lewis structure for G a ?

  • A G a
  • B G a
  • C G a
  • D G a
  • E G a

Q10:

In Lewis diagrams, what does each dot represent?

  • AA single inner-shell electron
  • BA pair of electrons
  • CA single outer-shell electron
  • DA single positive charge

Q11:

The Lewis dot structure for a sulfate ion gives sulfur a formal charge of zero with six bonds. Based on the structure and the Lewis dot theory, which of the following statements about the sulfur atom is false?

O S 2 O O O
  • ASulfur is less electronegative than oxygen.
  • BThe sulfur disobeys the octet rule.
  • CSulfur has more valence electrons than oxygen.
  • DSulfur has a greater number of electron shells than oxygen.

Q12:

Which of the following is the correct Lewis structure for a monomer of G a C l 3 ?

  • A
    Ga Cl Cl Cl
  • B
    Ga Cl Cl Cl
  • C
    Ga Cl Cl Cl
  • D
    Ga Cl Cl Cl
  • E
    Ga Cl Cl Cl

Q13:

Which of the following is the correct Lewis structure for C l B B C l 2 2 ?

  • A
    B Cl Cl B Cl Cl
  • B
    B Cl Cl B Cl Cl
  • C
    B Cl B Cl Cl Cl
  • D
    B B Cl Cl Cl Cl
  • E
    B Cl B Cl Cl Cl

Q14:

Which of the following is the correct Lewis structure for C O 2 ?

  • A
    C O O
  • B
    O O C
  • C
    O C O
  • D
    C O O
  • E
    C O O

Q15:

In the reaction equation, what does the dot next to the sodium indicate?

+ sodium atom sodium cation Na Na + e
  • AIt is unstable.
  • BIt is bonded to another, small atom.
  • CIt is negatively charged.
  • DIt is positively charged.
  • EIt has a lone electron: it is a free radical.

Q16:

In the reaction equation, what do the two dots on the calcium atom indicate?

+ calcium atom calcium cation Ca Ca 2 + 2 e
  • AIt is negatively charged.
  • BIt has two lone electrons, in separate orbitals: it is a diradical.
  • CIt is positively charged.
  • DIt is unstable.
  • EIt has a lone pair of electrons.

Q17:

In the Lewis structure shown, X and Y represent different elements and all valence electrons of the atoms are shown. The molecule is stable and neutral, and Y is an element in the second period of the periodic table.

X X Y X

What is the chemical symbol of element X ?

  • A H e
  • B F
  • C B e
  • D H
  • E L i

What is the chemical symbol of element Y ?

  • A O
  • B F
  • C B
  • D C
  • E N

Q18:

Which of the following is the correct Lewis structure for A s 3 ?

  • A
    As 3
  • B
    As
  • C
    As 3
  • D
    As
  • E
    As 3

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