1s² 2s² 2p⁶ 3s¹
Here's a breakdown:
* 1s²: The first energy level (n=1) has 2 electrons in the s orbital.
* 2s²: The second energy level (n=2) has 2 electrons in the s orbital.
* 2p⁶: The second energy level (n=2) has 6 electrons in the p orbital.
* 3s¹: The third energy level (n=3) has 1 electron in the s orbital.
Sodium has 11 electrons, and this configuration accurately accounts for all of them. It's important to note that this configuration follows the Aufbau principle and Hund's rule, ensuring the lowest possible energy state for the atom.
