0

Guest

Courses New

Sir Aluminium aur gallium ki atomic radius same kyo hoti hai?

Sir Aluminium aur gallium ki atomic radius same kyo hoti hai?

Grade:12th pass

1 Answers

Utsav Basu
70 Points
6 years ago
To under stand this question you will need to understand the concept of d-block contraction.
 
It is very tempting to assume that atomic radius of gallium is more than that of aluminium, since it has an extra shell of electrons. But, one factor often neglected is that the nuclear charge also increases as we go down the group. Generally this does’nt cause a problem for groups 1, 2, 14, 15, 16, 17, 18, but the effect is significant for group 13 elements. this is because this is the group just after the whole range of transition metals, which contain electrons in the ‘d’ orbitals. As I should expect you to know is that electrons in the d orbitals provide poor shielding to the nuclear charge which attracts the electrons of the outermost shell. As a result the valence electrons of gallium atom are strongly attracted by its nucleus resulting to a “contraction” to its atomic size. This is why atomic radii of gallium and aluminium are approximately equal.
 
P.S. You can check the real values of atomic radii at this link :
https://en.wikipedia.org/wiki/D-block_contraction

Think You Can Provide A Better Answer ?

Other Related Questions on Discuss with Askiitians Tutors

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More