How many orbitals of sodium-24 are fully filled?

Sodium-24 has an atomic number of 11, indicating it has 11 electrons. In its ground state, these electrons fill the orbitals in the following order: 1s² 2s² 2p⁶ 3s¹. The fully filled orbitals are the 1s, 2s, and 2p orbitals, totaling three fully filled orbitals.