Consider the given statements in general and mark the correct statements out of the following.

(SI) : The contraction in transition series is attributed to the imperfect shielding of one electron by another in the same subshell.

(SII) : The shielding of one $f$ electron by another is less than that of one d electron by another with the increase in nuclear charge along the series in the same subshell.

(SIII) : As a result of Lanthanoid contraction, $Z r$ and $H f$ have almost identical radii which accounts for their occurrence together in nature and for difficulty faced in their separation.

(SIV) : The size of lanthanoid ions in $+ 3$ state smoothly increases as their atomic number increases.

Open in App

Solution

In $L n^{+ 3}$ , size decreases smoothly as atomic number increases.
$d$ and $f$ orbitals are diffused and as a result their shielding is poor. Also shielding by a $d$ electron is greater than that of an $f$ electron in same subshell.

Suggest Corrections

Similar questions

From element to element, the actinoid contraction is greater than the lanthanoid contraction due to poor shielding by 5f-electrons in actinoids than that by 4f-electrons in the lanthanoids.

Q. Lanthanoid Contraction occurs due to poor shielding by electrons present in f-subshells.

STATEMENT-1 : Shielding effect increases as we go down the group.
STATEMENT-2 : With an increase in the number of electrons in the penultimate shell, shielding effect increases.

Q. The atomic size of

G a

and

A l

are almost same because of:

Q. A Lanthanoid contraction is the gradual decrease in the atomic and ionic radii of lanthanoids with an increase in the atomic number. If true press 1 else 0.

Join BYJU'S Learning Program

In Ln+3 , size decreases smoothly as atomic number increases. d and f orbitals are diffused and as a result their shielding is poor. Also shielding by a d electron is greater than that of an f electron in same subshell.

In $L n^{+ 3}$ , size decreases smoothly as atomic number increases.
$d$ and $f$ orbitals are diffused and as a result their shielding is poor. Also shielding by a $d$ electron is greater than that of an $f$ electron in same subshell.