The f-block consists of the two series lanthanoids and actinoids. Because Lanthanum closely resembles the Lanthanoids. The Lanthanoid resemble one another more closely than do the members ofordinary transition elements in any series. They have only one stable oxidation state. The chemistry of the actinoids is on the other hand, much more complicated. The complication arises partly owing to the occurance ofa wide range of oxidation states in these elements and partly because their radioactivity creates special problems in their study
Wrong statement of the following is

Options

A. Atomic radius of Lanthanoids decreases steadilyfrom Ce to Lu
B. The sheilding of a 4f electron by another is less than one d-electron by another with increase in nuclear charge along the series
C. Identical radii of Zr and Hf is a consequence of Lanthanoide contraction
D. `Ce^(+4)` is a strong oxidising agents

Answer

A

Explanation

Left to right decreasing order of Ionic radius but not steady decreases