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.

   Which ion does calcium, an alkaline earth metal, form, Jun?

   • Ca²⁻
   • Ca²⁺
   • Ca⁺
4. 4.

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

   • Br⁻
   • Br⁷⁺
   • Br⁺
5. 5.

   Sodium and chlorine combine. In what ratio, Luz?

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

   Milo says lithium is the most reactive alkali metal because it is first. Agree or disagree?

   • Disagree: reactivity rises down the group
   • Agree: lighter metals react more
   • Agree: the first one reacts most
7. 7.

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

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

   Where are most metals on the periodic table, Ren?

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

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

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

    Which describes a typical nonmetal, Zee?

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