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(A) $1$. Lanthanide contraction is the steady decrease in the atomic and ionic radii of lanthanides with an increase in atomic number.$2$. As we move

Vedclass · Accepted Answer

Poor shielding of one of $4f$ electron by another in the sub-shell.

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(A) $1$. Lanthanide contraction is the steady decrease in the atomic and ionic radii of lanthanides with an increase in atomic number.$2$. As we move from $La$ to $Lu$, electrons are added to the $4f$ subshell.$3$. The $4f$ orbitals have a very diffuse shape, which results in poor shielding of the nuclear charge by the $4f$ electrons.$4$. Due to this poor shielding, the effective nuclear charge experienced by the outer electrons increases, causing the electron cloud to be pulled closer to the nucleus, resulting in a decrease in atomic size.$5$. Therefore, the main cause is the poor shielding of one $4f$ electron by another.

Which of the following factors may be regarded as the main cause of lanthanide contraction?

Similar Questions

Which elements of the first transition series have higher ionization enthalpy values than their neighboring elements?

Which of the following is a diamagnetic transition metal ion?

Which of the following species is expected to show the highest magnetic moment? (At. Nos.: $Cr = 24$,$Mn = 25$,$Co = 27$,$Ni = 28$,$Cu = 29$)

Write down the electronic configuration of:
$(i) Cr^{3+}$
$(ii) Pm^{3+}$
$(iii) Cu^{+}$
$(iv) Ce^{4+}$
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$(vii) Mn^{2+}$
$(viii) Th^{4+}$

Which element from the following is $NOT$ regarded as a transition element?

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