The unpaired electrons in $Al$ and $Si$ are present in the $3p$ orbital. Which electrons will experience more effective nuclear charge from the nucleus?

(B) Nuclear charge is defined as the net positive charge experienced by an electron in a multi-electron atom.
The higher the atomic number,the higher is the nuclear charge. Silicon $(Si)$ has $14$ protons while aluminium $(Al)$ has $13$ protons.
Since the atomic number of $Si$ $(Z=14)$ is greater than that of $Al$ $(Z=13)$,the valence electrons in $Si$ experience a greater pull from the nucleus compared to $Al$.
Therefore,the electrons in the $3p$ orbital of $Si$ experience a more effective nuclear charge than those in $Al$.