The steady decreases in the ionic radius from $La^{3+}$ to $Lu^{3+}$ is termed as

The steady decreases in the ionic radius from $La^{3+}$ to $Lu^{3+}$ is termed as
  1. lanthanoid contraction
  2. actinoids contraction
  3. Both of these
  4. None of these

Solution

The steady decreases in the ionic radius from   L a 3+  to   L u 3+  is termed as lanthanoid contraction.

Consequences are :

Similar physical chemical properties among Lanthanoids .

The almost identical radii of Zr (160 pm) and Hf (159 pm)

Asked in: MHT CET Full Test 5

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