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  • Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Numbers in the parenthesis are atomic numbers).Op

Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Numbers in the parenthesis are atomic numbers).

Option: 1

Zr (40) and Hf (72)


Option: 2

Zr (40) and Ta (73)


Option: 3

Ti (22) and Zr (40)


Option: 4

Zr (40) and Nb (41)


Answers (1)

best_answer

Due to lanthanoid contraction, the atomic radii of Zr and Hf are nearly the same.

Hf has atomic number 72 and has an electronic configuration of [Xe]6s^24f^1^45d^2, due to the presence of electrons in poorly shielded f-orbitals. Effective nuclear charge experienced by outermost electrons increases and size of period 5 and 6 elements is nearly the same. 

The correct answer is option 1. 

Posted by

Ajit Kumar Dubey

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