Explain screening effect and s,p,d,f method

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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. The order of screening effect of electrons of

s, p, d

and

f

orbitals of a given shell of an atom on its outer shell electrons is:

The screening effect of electron of s, p, d and f orbitals of a given shell of an atom on its outer shell electrons are in the order of:

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

In a given shell, the order of screening effect is

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