Which of the following pairs has almost same radii ?

A l, G a

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B e, M g

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M g, A l

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B, B e

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Solution

The correct option is D $A l, G a$

$A l$ electronic configuration is $[N e] 3 s^{2} 3 p^{1}$

$G a$ electronic configuration is $[A r] 4 s^{2} 3 d^{10} 4 p^{1}$
The lectronic configuration of gallium shows that it contains 10 electrons in d -orbitals which do not screen the nucleus effectively because of the large size of d-orbitals, consequently the electrons are attracted by a greater force towards the nucleus, hence the atomic radius gallium decreases or gallium has almost same radii as that of alluminiu.
Hence option A is crrect.

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Similar questions

Considering the elements B, Al, Mg, and K, the correct order of their metallic character is:

(a) B > Al > Mg > K (b) Al > Mg > B > K

Q. Considering the elements

B, A l, M g

and

K

, the correct order of their metallic character is:

Question 17
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

The first ionistation enthalpies of Na, Mg, Al, and Si are in the order
(a) Na< Mg > Al < Si (b) Na> Mg > Al > Si
(c) Na< Mg< Al< Si (d) Na> Mg> Al < Si

N a^{+}

M g^{2 +}

A l^{3 +}

and

S i^{4 +}

are isoelectronic, their ionic size will follow the order:

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