Write electron configurations

Answer Key - Grade 10 Science Worksheet - Building Confidence

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

1. 1.

   Using 2n², how many electrons can shell n = 2 hold, Ari?

   8 electrons
2. 2.

   Using 2n², how many electrons can shell n = 3 hold, Bo?

   18 electrons

3. Read this first

   Use this

   Written 1s² 2s² 2p⁶ 3s² 3p⁴, or in shorthand [Ne] 3s² 3p⁴.

5. 3.

   On the ladder, how many electrons are in sulfur's 3p subshell, Jun?

   • 2
   • 4
   • 6
6. 4.

   On the ladder, which subshell fills first, Kira?

   Use the picture in question 3.

   • 1s
   • 3p
   • 2p
7. 5.

   On the ladder, what does [Ne] stand for in sulfur's shorthand, Luz?

   Use the picture in question 3.

   • The last 6 electrons
   • The first 10 electrons
   • A neon atom bonded on the side
8. 6.

   Which subshell fills just after 3p, Milo?

   • 4s
   • 4p
   • 3d
9. 7.

   Which subshell fills just after 4s, Noah?

   • 5s
   • 3d
   • 4p
10. 8.

    Where does potassium's 19th electron go, Pia?

    • Into 4s
    • Into 3d
    • Into 3p
11. 9.

    How many electrons can a d subshell hold, Tala?

    • 6
    • 10
    • 14
12. 10.

    What is the most electrons one orbital can hold, Zee?

    • 2
    • 8
    • 6