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Question

The atomic size of Ga and Al are almost same because of:


Correct Answer
A
Poor shielding effect of dorbitals electrons in Ga 
Your Answer
B
More shielding effect of delectrons in Ga 
Your Answer
C
Poor shielding effect of forbital in Ga 
Your Answer
D
High shielding effect of 3s, 3p and 3d electrons in Ga 

Solution

The correct option is A Poor shielding effect of dorbitals electrons in Ga 
Penetration describes the proximity of electrons in an orbital to the nucleus. Electrons that have greater penetration can get closer to the nucleus and effectively block out the charge from electrons that have less proximity. This is known as shielding. 
The shielding effect of d-electrons are poor and this leads to smaller atomic radii than expected. Hence, Ga even though lies below Al, has almost same atomic size.
 

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