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a
Among the following elements: K, Mn, Cd, Cs, Fe, Cu, Pb, Os, Y. The number of transition element is 4.
b
All the lanthanides and actinides belong to III B or the 3rd group in the Periodic table.
c
The inner transition elements belong to the f' block of the periodic table and are shown separately at the bottom of the periodic table.
d
The d-block elements have variable valency.
answer is B.
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