Which one of the following statements concern | vedclass

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(B) The chemistry of the lanthanides differs from main group elements and transition metals because of the nature of the $4f$ orbitals. These orbitals

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The ionic radii of trivalent lanthanides steadily increase with increase in atomic number.

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(B) The chemistry of the lanthanides differs from main group elements and transition metals because of the nature of the $4f$ orbitals. These orbitals are buried inside the atom and are shielded from the atom's environment by the $5s$,$5p$,and $5d$ electrons. As a consequence,the ionic radii of trivalent lanthanides steadily decrease with an increase in atomic number,a phenomenon known as the lanthanide contraction. Therefore,statement $B$ is false because the radii decrease,not increase. All lanthanide elements exhibit the $+3$ oxidation state as their most typical state. Due to the lanthanide contraction,these elements have high density.

Which one of the following statements concerning lanthanide elements is false?

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