Question:
Which of the following orders is not correct against the given property?
Which of the following orders is not correct against the given property?
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Atomic size generally increases down a group, but d- and f-electrons can cause irregularities due to poor shielding, affecting the atomic radius trend.
Updated On: Mar 22, 2025
- \( Ga<In<Tl<Al<B \) - melting point
- \( Al<Ga<In<Tl<B \) - Electronegativity
- \( B<Al<Ga<In<Tl \) - Density
- \( B<Al<Ga<In<Tl \) - Atomic Radius
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The Correct Option is D
Solution and Explanation
Explanation:
- The atomic radius generally increases down a group due to the addition of extra electron shells.
- However, in Group 13, gallium (Ga) has a slightly smaller atomic radius than aluminum (Al) due to the presence of d-electrons, which cause poor shielding, leading to a contraction in size.
- The correct order of atomic radius should be: \( B<Ga<Al<In<Tl \).
- Since the given order contradicts this trend, it is the incorrect one.
- However, in Group 13, gallium (Ga) has a slightly smaller atomic radius than aluminum (Al) due to the presence of d-electrons, which cause poor shielding, leading to a contraction in size.
- The correct order of atomic radius should be: \( B<Ga<Al<In<Tl \).
- Since the given order contradicts this trend, it is the incorrect one.
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