p-Block Elements-I 1 Question 5
5. The electronegativity of aluminium is similar to
(2019 Main, 10 Jan I)
(a) lithium
(b) carbon
(c) beryllium
(d) boron
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Answer:
Correct Answer: 5. (b)
Solution:
- Let, us consider the electronegativity values of the given elements,
Group-1 Group-2 Group-13 Group-19
$\begin{array}{ll}\text { Period 2 } & \Rightarrow \underset{(1.0)}{\mathrm{Li}} \underset{(1.5)}{\mathrm{Be}} \underset{(2.0)}{\mathrm{B}} \ \text { Period 3 } & \Rightarrow \underset{(1.5)}{\mathrm{Al}}\end{array}$
Be and Al show diagonal relationship which is based on their same $\frac{Z^{}}{r}$ value ( $Z^{}$ is effective nuclear charge, $r=$ atomic radius). So, they have similar electronegativity.
