TS EAMCET · Chemistry · d and f Block Elements
What is the effect of lanthanoid contraction in lanthanoid series of elements with increasing atomic number?
- A Decreases in atomic radii
- B Increases in atomic radii
- C Decreases in melting point
- D Increases in melting point
Answer & Solution
Correct Answer
(A) Decreases in atomic radii
Step-by-step Solution
Detailed explanation
Lanthanide contraction is the steady decrease in size of atoms and ions of rare earth elements with increasing atomic number from lanthanum. (Atomic number \(=57\) ) It is caused by poor shielding effect of \(4 f\)-electrons. In row 3, we have \(4 f\)-electrons which do not…
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