Families of elements and their properties

Answer Key - Grade 10 Science Worksheet - Challenge Me

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

1. 1.

   Lithium's density is 0.534 g/cm³ and cesium's is 1.93 g/cm³ (PubChem). How many times denser is cesium, to 0.01, Ari?

   3.61 times
2. 2.

   Sodium's density is 0.97 g/cm³ and rubidium's is 1.53 g/cm³ (PubChem). How many times denser is rubidium, to 0.01, Bo?

   1.58 times
3. 3.

   Lithium's density is 0.534 g/cm³ and potassium's is 0.89 g/cm³ (PubChem). How many times denser is potassium, to 0.01, Esme?

   1.67 times
4. 4.

   Which ion does bromine, a halogen, form, Kira?

   • Br⁺
   • Br⁻
   • Br⁷⁺
5. 5.

   Sodium and chlorine combine. In what ratio, Luz?

   • 1 to 1, as NaCl
   • 2 to 1, as Na₂Cl
   • 1 to 7, as NaCl₇
6. 6.

   Noah says cesium holds its outer electron more tightly than sodium. Agree or disagree?

   • Agree: heavier atoms hold tighter
   • Agree: bigger atoms grip harder
   • Disagree: cesium holds it less tightly
7. 7.

   Pia says halogens are unreactive like noble gases. Agree or disagree?

   • Agree: both are gases
   • Disagree: they react readily
   • Agree: halogens have full shells
8. 8.

   Where are most metals on the periodic table, Ren?

   • To the right of the staircase
   • In group 18
   • To the left of the staircase
9. 9.

   Silicon sits along the staircase line. What is it, Tala?

   • An alkali metal
   • A metalloid
   • A noble gas
10. 10.

    Which describes a typical nonmetal, Zee?

    • A poor conductor
    • A good conductor
    • Shiny and bendable