(solved)Question 2.65 of NCERT Class XI Chemistry Chapter 2

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

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Question 2.65NCERT Class XI Chemistry

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

Note: Q 2.64 is simple enough. Please write an email to us if you face any difficulty.

Solution in Detail(video solution below this)

Write the electronic configurations first

$\displaystyle \text{Al is: } 1s^22s^22p^63s^23p^1$

$\displaystyle \text{Si is: } 1s^22s^22p^63s^23p^2$

we have to compare same orbitals, i.e., 3p

both orbitals are shielded by the same
number of electrons, i.e., $\displaystyle 1s^22s^22p^63s^2$

$\displaystyle \therefore$ nuclear charge (Z) is the deciding factor

$\displaystyle Z_{Al} = 13$ and $\displaystyle Z_{Si} = 14$

Since Si has more protons, each 3p electron
of Si experiences more effective nuclear charge

Video Explanation

Please watch this youtube video for a quick explanation of the solution: