Q. Which one of the following correctly represents the variation of electronegativity $ (EN) $ with atomic number $ (Z) $ of group $ 13 $ elements?
EAMCETEAMCET 2014
Solution:
For group $13$ elements, electronegativity decreases from $B$ to $A$ l. The decrease in electronegativity from $B$ to $Al$ is due to increased size of $Al$. The remaining three elements are more electro negative than $Al$ and their electroonegativity increases from Ga to $TI$.
Thus, the correct order of electronegativity of group $13 $ elements are as follows.
Element
B
Al
Ga
In
TI
EN (at Pauling scale)
2.0
1.5
1.6
1.7
1.8
| Element | B | Al | Ga | In | TI |
| EN (at Pauling scale) | 2.0 | 1.5 | 1.6 | 1.7 | 1.8 |