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Question
The lanthanide contraction is responsible for the fact that
The lanthanide contraction is responsible for the fact that
and 
have about the same radius
and 
have similar oxidation state
and 
have about the same radius 
and 
have the same oxidation sateOpen in App
Solution
The correct option is C and have about the same radius
Atomic radii down the group for transition elements first increases, becomes almost equal and then decreases. This is due to poor shielding of one of 4f electron by another in the subshell which results in greater effective nuclear charge; this effect is called lanthanide contraction.
and have about the same radius Atomic radii down the group for transition elements first increases, becomes almost equal and then decreases. This is due to poor shielding of one of 4f electron by another in the subshell which results in greater effective nuclear charge; this effect is called lanthanide contraction.
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