Question
The unpaired electrons in Al and Si are present in 3p orbital. Which electrons will experience more effective nuclear charge from the nucleus ?
Solution
The electronic configuration of Al(Z = 13) and Si (Z = 14) are represnted as below:

Since silicon has greater nuclear charge (+14) than aluminium (+13), therefore the unpaired 3p electrons of silicon will experience more effective nuclear charge.

Since silicon has greater nuclear charge (+14) than aluminium (+13), therefore the unpaired 3p electrons of silicon will experience more effective nuclear charge.