Lanthanoid contraction is caused due to

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The main reason for lanthanoid contraction is the poor shielding of the outer shell electrons by $4f$ electrons.Because the $4f$ orbitals have a d

Vedclass · Accepted Answer

the imperfect shielding on outer electrons by $4f$ electrons from the nuclear charge

Vedclass · Answer

(B) The main reason for lanthanoid contraction is the poor shielding of the outer shell electrons by $4f$ electrons.Because the $4f$ orbitals have a diffuse shape,their shielding effect is imperfect.Consequently,the effective nuclear charge experienced by the outer electrons increases,causing the nucleus to attract the outer shell electrons more strongly,which leads to a decrease in atomic and ionic radii across the lanthanoid series.

Similar Questions

Lanthanoid contraction is caused due to an increase in . . . . . . .

The pair of lanthanoid ions which are diamagnetic is

Which of the following Lanthanoid ions are diamagnetic?

Fill in the blanks:
$1.$ The size of $M^{3+}$ ions in the actinoid series ........... with an increase in atomic number.
$2.$ The common oxidation state of elements in the actinoid series is .......... .
$3.$ The appearance of elements in the actinoid series is like .......... .

Arrange $Ce^{+3}, La^{+3}, Pm^{+3}$ and $Yb^{+3}$ in increasing order of their ionic radii.

Vedclass Test Series

Exam Paper Generator

Online Exam Module