• # question_answer The atomic radius of elements of which of the following series would be nearly the same [MP PET 1997] A) $Na$$K$$Rb$$Cs$ B) $Li$$Be$$B$$C$ C) $Fe$$Co$$Ni$$Cu$ D) $F$$Cl$$Br$$I$

$Fe,\,Co,\,Ni,\,Cu$. Due to shielding of d-electrons, the effect of increased nuclear charge due to increase in atomic no. neutralised. Consequently atomic radius remains almost unchanged after chromium.