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Structure Of Atom

Question
CBSEENCH11005347

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:
space Atomic space number space of space Aluminium space is 13
space Al colon space 1 straight s squared 2 straight s squared 2 straight p to the power of 6 3 straight s squared 2 straight p to the power of 1 subscript straight x left parenthesis one space unpaired space electron right parenthesis

Atomic space number space of space silicon space is space 14
Si colon space 1 straight s squared 2 straight s squared 2 straight p to the power of 6 3 straight s squared 3 straight p to the power of 1 straight x 3 straight p to the power of 1 straight y space to the power of space space space space end exponent left parenthesis Two space unpaired space electrons right parenthesis
Since silicon has greater nuclear charge (+14) than aluminium (+13), therefore the unpaired 3p electrons of silicon will experience more effective nuclear charge.