How many electrons are in the full outer shell of neon and argon?

Both neon and argon possess eight electrons in their outermost valence shell.12

This arrangement of eight electrons is known as an octet, a stable configuration that contributes to the chemical inertness characteristic of noble gases. While neon completes its outer L shell with these eight electrons, argon maintains an outer octet in its M shell, with its s and p subshells fully occupied.312