AP EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
In lanthanides, with increase in atomic number atomic radius decreases, except for the element \(\underline{X}\). What is \(\underline{X}\) ?
- A Gd
- B Eu
- C Tm
- D Dy
Answer & Solution
Correct Answer
(B) Eu
Step-by-step Solution
Detailed explanation
Lanthanides show decrease in atomic radius with increase in atomic number since electrons are filled in the \(f\)-subshell. Since, the \(f\)-subshell after poor shielding, the atomic size will decrease as the nuclear charge increases. Eu electronic configuration is…
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