(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 ?

Categories | About Hoven's Blog

Parveen,

Question 2.65
NCERT 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:

Creative Commons License
This Blog Post/Article "(solved)Question 2.65 of NCERT Class XI Chemistry Chapter 2" by Parveen is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.