Question

Which of the following has largest ionic radii?

• A. $F^{-}$
• B. ${Be}^{-}$
• C. $H^{-}$
• D. ${CI}^{-}$

Answer 1

The correct option is D ${CI}^{-}$

• An ionic radius is defined as the radius of an atom's ion.Ionic radii decrease across periods because effective nuclear charge increases. That is, the net positive charge experienced by an electron in the atom increases as a result of the number of protons in the nucleus increasing.
  
• The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase.
  
• Considering above trends wecan see the ionic raddi order is $H^{-}<B{e}^{-}<F^{-}<C{l}^{-}$