Question

choose the electron configuration for sodium (na) in both longhand notation and noble - gas notation. a link to the periodic table is provided for you. longhand notation: 1s²2s²2p⁶3s²3p⁴ 1s²2s²2p⁶3s¹ 1s²2s²2p⁶3s²3p⁶4s²3d³ 1s²2s²2p³

Explanation:

Sodium has an atomic number of 11. The electron - filling order follows the Aufbau principle. The first two electrons fill the 1s orbital ($1s^{2}$), the next two fill the 2s orbital ($2s^{2}$), the next six fill the 2p orbital ($2p^{6}$), and the last electron goes into the 3s orbital ($3s^{1}$).

Answer:

1s²2s²2p⁶3s¹