What is the cause of lanthanoid contraction?
- APoor shielding effect of outer electrons by $4f$ electrons.
- BEffective shielding effect of outer electrons by $5d$ electrons.
- CSame effective nuclear charge of elements from $Ce$ to $Lu$.
- DImperfect shielding of outer electrons by $4f$ electrons.
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Similar Questions
Which of the following elements are included in the actinoid series?
Easy
View SolutionFill 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 .......... .
$1.$ 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 .......... .
Difficult
View SolutionThe common oxidation state of the elements of the lanthanoid series is .....
Easy
View SolutionWhich is not the correct statement? (At. nos. $Ce = 58, Lu = 71, La = 57, Yb = 70$)
What is the correct order of ionic radii for the $+3$ oxidation state in $Ce, La, Pm,$ and $Yb$?
Medium
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