State a consequence of the lanthanoid contraction shown by the transition elements.
Solution
Because of the lanthanoid contraction, the expected size increase from the 4d to the 5d series is cancelled; the radii of the third-series transition metals are virtually the same as those of the corresponding second-series members.
Consequently pairs like Zr–Hf and Nb–Ta have nearly identical properties and occur together, being very difficult to separate.
Consequently pairs like Zr–Hf and Nb–Ta have nearly identical properties and occur together, being very difficult to separate.
CBSE Class 12 Board · 2000 · All India · Subjective