Final answer:
Sodium's electron configuration is 1s²2s²2p⁶3s¹, while the noble gas configuration is abbreviated as [Ne] 3s¹.
Step-by-step explanation:
The electron configuration of sodium (Na) is 1s²2s²2p⁶3s¹. Sodium's noble gas configuration can be abbreviated as [Ne] 3s¹, where [Ne] represents the core electrons that are identical to the configuration of neon. In this configuration, the first ten electrons fill the 1s, 2s, and 2p subshells completely, which are the same as neon's electron configuration, while the eleventh electron, the valence electron, occupies the 3s subshell.