$(D)$ The atomic radius of $Al$ is $143 \ pm$ and that of $Ga$ is $135 \ pm$.Thus, the atomic radius of $Ga$ is actually smaller than that of $Al$.Thi

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If both the Assertion and Reason are incorrect.

$(D)$ The atomic radius of $Al$ is $143 \ pm$ and that of $Ga$ is $135 \ pm$.Thus, the atomic radius of $Ga$ is actually smaller than that of $Al$.This occurs because, in $Ga$, the $3d^{10}$ electrons provide poor shielding of the nuclear charge, leading to a higher effective nuclear charge which pulls the valence shell closer to the nucleus.Since the Assertion is false and the Reason is true, the correct option is $D$.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Atomic and Ionic radii

Difficult

Assertion : Atomic radius of gallium is higher than that of aluminium.
Reason : The presence of additional $d$-electrons offers poor screening effect for the outer electrons from increased nuclear charge.

AIIMS 2017 All AIIMS

A
If the Assertion is correct but Reason is incorrect.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
D
If both the Assertion and Reason are incorrect.

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Classification of Elements and Periodicity in Properties

Subtopic

Atomic and Ionic radii

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In case of isoelectronic species,the size of $F^{-}$,$Ne$,and $Na^{+}$ is affected by:

DifficultJEE MAIN 2024

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Consider the following species: $N^{3-}, O^{2-}, F^{-}, Na^{+}, Mg^{2+}$ and $Al^{3+}$
$(a)$ What is common in them?
$(b)$ Arrange them in the order of increasing ionic radii.

Medium

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What is the difference between van der Waals radius and covalent radius?

Easy

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The size of the following species increases in the order:

MediumIIT 1990

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The ionic radii of $K^{+}$,$Na^{+}$,$Al^{3+}$ and $Mg^{2+}$ are in the order:

EasyJEE MAIN 2021

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Assertion : Atomic radius of gallium is higher than that of aluminium.Reason : The presence of additional $d$-electrons offers poor screening effect for the outer electrons from increased nuclear charge.

Similar Questions

In case of isoelectronic species,the size of $F^{-}$,$Ne$,and $Na^{+}$ is affected by:

Consider the following species: $N^{3-}, O^{2-}, F^{-}, Na^{+}, Mg^{2+}$ and $Al^{3+}$$(a)$ What is common in them?$(b)$ Arrange them in the order of increasing ionic radii.

What is the difference between van der Waals radius and covalent radius?

The size of the following species increases in the order:

The ionic radii of $K^{+}$,$Na^{+}$,$Al^{3+}$ and $Mg^{2+}$ are in the order:

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Assertion : Atomic radius of gallium is higher than that of aluminium.
Reason : The presence of additional $d$-electrons offers poor screening effect for the outer electrons from increased nuclear charge.

Consider the following species: $N^{3-}, O^{2-}, F^{-}, Na^{+}, Mg^{2+}$ and $Al^{3+}$
$(a)$ What is common in them?
$(b)$ Arrange them in the order of increasing ionic radii.