Answer:
1s^2 2s^2 2p^6 3s^2
Step-by-step explanation:
1s^2 2s^2 2p^6 3s^2
Use the Periodic Table to track the position of each electron. An s orbital accepts 2 electrons. A p orbital accepts 6 electrons.
Each line on the table represents the primary energy shell (1 and 2 in this case.