For ions having identical charges, the ionic radii decrease slowly with the increase in the atomic number across a given series of the transition elements.
Elements (m): |
Ionic radius,(M2+)/pm
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Explanation :The gradual decrease in the values of ionic radius across the series of transition elements is due to the increase in the effective nuclear charge.
Solved example 1: Which of the following trivalent ion has the largest atomic radii in the lanthanide series
(a) La (b) Ce
(c) Pm (d) Lu
Ans: a
Solved example 2:The atomic radii of the elements are almost same of which series
(a) Fe – Co – Ni
(b) Na – K – Rb
(c) F – Cl – Br (d) Li – Be – B
Ans: a
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