# Tag Info

Put very roughly, we can boil this down to why aluminum and sulfur are depressed with respect to the average of the surrounding elements. Aluminum is $\ce{[Ne]{3}s^2{3}p^1}$. Its first ionization removes the $3p$ electron while leaving the more stable $3s$ orbital intact, whereas magnesium has to break its more stable $3s$ orbital. So by comparison, the ...