Question:
Electropositive character for the elements of group $13$ follows the order
Electropositive character for the elements of group $13$ follows the order
Updated On: Jul 6, 2022
- $B > Al > Ga > In > Tl$
- $B < Al < Ga < In< Tl$
- $B < Al > Ga < In> Tl$
- $B < Al > Ga > In> Tl$
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The Correct Option is D
Solution and Explanation
As we move from $B$ to $Al$, the sum of $\Delta_iH_1 + \Delta_iH_2 + \Delta_iH_3$ decreases substantially ($6887\, kj \,mol^{-1}$ to $5137 \,kj \,mol^{-1}$) due to increase in the atomic size and hence $Al$ has a high tendency to lose electrons. Since the electrode potentials increase from $Al$ to $Tl$, therefore, their electropositive character decreases, i.e., $Al (- 1.66\, V)$ to $Ga (- 0.56 \,V)$ to $In (- 0.34\, V)$ to $Tl (+ 1.26\, V)$ accordingly.
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
- P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.
P block elements consist of:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family