Which of the following sets of elements have almost the same atomic radii.

Which of the following sets of elements have almost the same atomic radii.
  1. $\mathrm{Fe}, \mathrm{Co}, \mathrm{Ni}, \mathrm{Cu}$
  2. He, Ne, Ar, Xe
  3. $\mathrm{Be}, \mathrm{Mg}, \mathrm{Ca}, \mathrm{Sr}$
  4. $\mathrm{Cl}$, Br, I

Solution

The atomic radii of one series of transition metals do not vary greatly because inner $3 \mathrm{~d}$ atomic orbitals are being filled, although there is a general decrease across a series of transition elements ~

Asked in: JEE-TOPICTESTS-CHEMISTRY

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