Question

Why does aluminium have higher ionization potential than silicon?

Answer 1

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The simplest answer to this question is that silicon has exactly one more proton than aluminum. As a result, silicon has a greater attraction (effective nuclear charge) for its valence electrons compared to aluminum. More energy is required to ionize an atom of Si when compared to Al.

Answer 2

Answer:

Consider the subshell those second electrons have to leave. In Al+, you have to break into the full 3s subshell. In Si+, the electron configuration is 3s2 3p1, so you don't need to add extra energy to disrupt a completely filled subshell to kick off the next electron.