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Lanthanides Electronic Configuration

why s orbital...

Question

why s orbital has maximum shielding effect?

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Solution

Actually, s -orbitals are spherical and symmetrical in shape and also for a given quantum level or shell, the s-orbitals are closest to the nucleus. the two reasons make it stronger to restrict other electrons and so sheilds the nucleus which gets a maximum shielding effect to the nucleus.

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Q. The atomic size of

G a

A l

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State True or False.

The order of shielding effect for different orbital is

s > p > d > f

.

Q. Which of the followings are consequences of poor shielding effect of d and f orbital?

Q. Actinoid contraction is greater than lanthanoid contraction because the shielding effect of 5f orbitals is poorer than that of 4f orbitals, then why is the ionisation enthalpies of actinoids less than that of the lanthanoids?

Q. The nuclear charge actually experienced by an electron is termed as the effective nuclear charge. The effective nuclear charge Z* actually depends on the type of shell and orbital in which electron is actually present. The relative extent to which the various orbitals penetrate the electron clouds of other orbitals is

s > p > d > f

(for the same value of

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The phenomenon in which penultimate shell electrons act as screen or shield in between nucleus and valence shell electrons and thereby reducing nuclear charge is known as shielding effect. The penultimate shell electrons repel the valence shell electron to keep them loosely held with the nucleus. It is thus evident that more is the shielding effect, lesser is the effective nuclear charge and lesser is the ionization energy.
Which of the following valence electron experience maximum effective nuclear charge?

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