Screening effect of inner shells decreases the effective nuclear charge. The order of screening effect of subshells is s>p>d>f.
State whether the given statement is true or false.

True

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False

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Solution

The correct option is A True
In lanthanide elements, the electrons enter into 'f' subshell. Due to the poor screening effect of 'f' subshell, the increased nuclear charge cannot be compensated by the poor screening effect of the subshell. As a result, there is a marked increase in effective nuclear charge which results in steady decrease in atomic and ionic sizes among lanthanide elements.

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Similar questions

Q. Screening effect of inner shells decreases the effective nuclear charge. The order of screening effect of subshells is

s > p > d > f

. With respect to the above facts, predict the gradation of atomic size in lanthanide elements.

Q. With the increase in atomic number, screening effect increases both in group and period.
State whether the given statement is true or false.

Q. The formula for an effective nuclear charge is:

(if

σ

is screening constant)

Ionic radii vary in
(a) inverse proportion to the effective nuclear charge
(b) Inverse proportion to the square of effective nuclear charge
(c) direct proportion to the screening effect
(d) direct proportion to the square of screening effect

Question 22

Arrange s, p and d subshells of a shell in the increasing order of effective nuclear charge $(Z_{e f f})$ experienced by the electron present in them.

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Screening effect of inner shells decreases the effective nuclear charge. The order of screening effect of subshells is s>p>d>f.State whether the given statement is true or false.

Screening effect of inner shells decreases the effective nuclear charge. The order of screening effect of subshells is s>p>d>f.
State whether the given statement is true or false.