Answer :
Explanation: Outer shell electronic configuration for Group 18 is :
[tex]\text{Group 18: }ns^2np^6[/tex] ( have 8 electrons in the outer shell)
The electronic configurations for other groups are:
[tex]\text{Group 1: }ns^1[/tex] ( have 1 electron in the outer shell}
[tex]\text{Group 2: }ns^2[/tex] ( have 2 electrons in the outer shell)
[tex]\text{Group 15: }ns^2np^3[/tex] ( have 5 electrons in the outer shell)
[tex]\text{Group 16: }ns^2np^4[/tex] ( have 6 electrons in the outer shell)
[tex]\text{Group 17: }ns^2np^5[/tex] ( have 7 electrons in the outer shell)
Comparing the electron configurations of group 18 to other groups.
Group 18 has fully filled outer shell, that is 8 electrons in the outer shell, while others are partially filled.