Families of elements and their properties

Answer Key - Grade 10 Science Worksheet - Building Confidence

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

1. 1.

   PubChem lists lithium's melting point as 453.65 K and sodium's as 370.95 K. How many kelvins lower is sodium's, Ari?

   82.7 K
2. 2.

   PubChem lists sodium's melting point as 370.95 K and potassium's as 336.53 K. How many kelvins lower is potassium's, Bo?

   34.42 K
3. 3.

   PubChem lists potassium's melting point as 336.53 K and cesium's as 301.59 K. How many kelvins lower is cesium's, Esme?

   34.94 K
5. 4.

   Using the table, which alkali metal has the lowest density, Kira?

   • Lithium
   • Rubidium
   • Cesium
6. 5.

   Using the table, which alkali metal melts at the lowest temperature, Luz?

   Use the picture in question 4.

   • Sodium
   • Lithium
   • Cesium
7. 6.

   What is the family name for group 1 metals, Milo?

   • Halogens
   • Alkali metals
   • Noble gases
8. 7.

   Magnesium and calcium belong to which family, Pia?

   • Halogens
   • Alkali metals
   • Alkaline earth metals
9. 8.

   How many valence electrons does each alkali metal have, Ren?

   • 7
   • 2
   • 1
10. 9.

    How many valence electrons does each halogen have, Tala?

    • 1
    • 17
    • 7
11. 10.

    Why are neon and argon in the same family, Zee?

    • Both are metals
    • Both have full outer shells
    • Both have 18 protons in the nucleus