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13.Nuclei
easy
निम्नलिखित समूह (Group) $13$ के तत्वों की बढ़ती हुई परमाणु त्रिज्याओं का क्रम है
A
$\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}$
B
$\mathrm{Ga}<\mathrm{Al}<$ In $<$ $Tl$
C
$\mathrm{Al}<\mathrm{In}<\mathrm{Ga}<\mathrm{Tl}$
D
$\mathrm{Al}<\mathrm{Ga}<\mathrm{Tl}<\mathrm{In}$.
(IIT-2016)
Solution
The increasing order of atomic radius of group $13$ elements is: $Ga < AI < In < TI$. Due to the poor shielding of $d$-electrons in Ga , its radius is lesser than that of Al.
Standard 12
Physics
