Which of the following pairs of elements have almost similar atomic radii? math xmlns=http://www...

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Which of the following pairs of elements have almost similar atomic radii?
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn1/mnmo)/momo /momiZr/mimo,/momo /momiHf/mi/math
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn2/mnmo)/momo /momiMo/mimo,/momi mathvariant=normalW/mi/math
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn3/mnmo)/mo/math \( \mathrm{Co}, \mathrm{Ni} \)
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn4/mnmo)/mo/math All of these
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