Final answer:
The Bohr model of the sodium atom in its ground state features three shells, with the electron configuration being [Ne]3s¹.
Step-by-step explanation:
The Bohr model of the sodium atom in the ground state consists of three electron shells. According to the model, sodium (atomic number 11) has its electrons arranged in the shells as follows: 2 in the 1s subshell (1s²), 2 in the 2s subshell (2s²), 6 in the 2p subshell (2p⁶), and one electron in the 3s subshell (3s¹), which is the valence electron. This configuration can also be written in a condensed format as [Ne]3s¹, indicating sodium has one more electron than neon, a noble gas.