Question

Which one of the following correctly represents the variation of electronegativity $(EN)$ with atomic number $(Z)$ of group $13$ elements?

• A.
• B.
• C.
• D.

Answer 1

Answer: (D)

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