Cambridge Secondary (7-9). Stage 9. MCE Science. Workbook - Unit 4: The Structure of the Atom and the Periodic Table - Question 9

Complete the diagram to show the arrangement of electrons in an atom of argon. Include the following labels: electrons, nucleus, shell. Use the Periodic Table to help you.

Periodic Table lookup: argon, Ar; atomic number 18; the mass value used for this exercise is 40.