Which kind of bond forms: ionic, covalent or metallic

Answer Key - Grade 10 Science Worksheet - Building Confidence

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

1. 1.

   Chlorine's electronegativity is 3.16 and sodium's is 0.93 (Pauling, PubChem). What is the difference, Ari?

   2.23

2. Read this first

   Dot diagram

   Electrons moved, shared or pooled. In NaCl, sodium's one outer electron moves to chlorine, giving Na⁺ and Cl⁻. In H₂O, oxygen shares a pair of electrons with each hydrogen. In a metal such as aluminum, atoms pool their outer electrons into a sea around positive ions.

3. 2.

   On the card, what kind of bond holds NaCl together, Jun?

   • Metallic: a sea
   • Ionic: an electron moved
   • Covalent: electrons shared
4. 3.

   On the card, what kind of bonds hold H₂O together, Kira?

   • Ionic: electrons moved
   • Covalent: pairs shared
   • Metallic: a sea
5. 4.

   On the card, how are electrons held in aluminum metal, Luz?

   • Shared in pairs
   • Moved to oxygen
   • Pooled in a sea
6. 5.

   Calcium bonds with chlorine in CaCl₂. What kind of bond is it, Milo?

   • Metallic
   • Covalent
   • Ionic
7. 6.

   Carbon bonds with oxygen in CO₂. What kind of bond is it, Noah?

   • Covalent
   • Ionic
   • Metallic
8. 7.

   How are the atoms in a copper wire bonded, Pia?

   • Covalent
   • Ionic
   • Metallic
9. 8.

   What holds atoms together in every kind of bond, Ren?

   • Glue between the nuclei
   • Attractions involving electrons
   • Gravity
10. 9.

    What attracts Na⁺ and Cl⁻ to each other, Tala?

    • Their equal masses
    • Their shared pair of electrons
    • Their opposite charges
11. 10.

    Two oxygen atoms bond in O₂. How are the electrons shared, Zee?

    • Kept on one atom
    • Moved to make ions
    • Equally