Grade 10 · Science · Chemistry

10th grade Draw Lewis structures of molecules worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

Level: Building Confidence · On Level · Challenge Me

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Draw Lewis structures of molecules

Grade 10 Science Worksheet - Building Confidence

NameDate

Circle the best answer, or write your answer on the line.

Methane, CH₄, has 1 carbon atom with 4 valence electrons and 4 hydrogen atoms with 1 each. How many valence electrons in all, Ari?
Carbon dioxide, CO₂, has 1 carbon atom with 4 valence electrons and 2 oxygen atoms with 6 each. How many valence electrons in all, Esme?
3.
On the card, how many lone pairs does the oxygen in H₂O have, Jun?
- Two
- Zero
- Four
4.
On the card, what kind of bond joins the two atoms in O₂, Luz?
Use the picture in question 3.
- A double bond
- A single bond
- No bond
5.
What does the octet rule say, Milo?
- Atoms tend to have 8 outer electrons
- Molecules have 8 atoms
- Atoms tend to have 8 protons
6.
How many electrons does hydrogen need around it in a molecule, Noah?
- 4
- 8
- 2
7.
How does nitrogen in NH₃ reach 8 electrons, Pia?
- 4 bonds and no lone pairs
- 2 bonds and 2 lone pairs
- 3 bonds and 1 lone pair
8.
How many electrons does one line in a Lewis structure stand for, Ren?
- 1
- 2
- 8
9.
What does a pair of dots on one atom show, Tala?
- A lone pair
- A shared bond
- Two protons
10.
How many electrons are shared in a double bond, Zee?
- 2
- 4
- 8

Draw Lewis structures of molecules. Every version has 10 questions, and the answer key prints on the second page.

I can count a molecule's valence electrons and draw its skeleton with single bonds.
I can place lone pairs so each atom has an octet (hydrogen has 2).
I can use double bonds when single bonds leave atoms short, as in O₂ and CO₂.
I can check a drawing for wrong electron counts or too many bonds.

Standard: none (TX, FL)

Lewis structure: A drawing of a molecule's bonds and lone pairs

lone pair: Two valence electrons not shared in a bond

single bond: One shared pair of electrons

double bond: Two shared pairs of electrons

octet rule: Atoms tend to end with 8 outer electrons

Your child counted each kind of atom once. Add the valence electrons of every atom in the molecule.

Your child took one electron per bond. Each single bond is a shared pair: 2 electrons.

Your child counted lone electrons, not pairs. Divide the leftover electrons by 2 to get lone pairs.

What is the most common mistake with draw lewis structures of molecules?

Your child counted each kind of atom once. Add the valence electrons of every atom in the molecule.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

Every sheet you scan goes into your child’s record: dated, marked and ready for the year-end portfolio. Homeschool records