Discussion
Which of the following statement is INCORRECT regarding f-block elements?
Answer: E
The incorrect statement is the configuration \((n-1)f^{1-14}(n-1)d^{0-1}ns^{2}\).
In the f-block, the f orbitals being filled are two shells inside the outermost: for actinoids the configuration is \(5f^{1-14}6d^{0-1}7s^{2}\), that is \((n-2)f^{1-14}(n-1)d^{0-1}ns^{2}\) with \(n = 7\). Writing \((n-1)f\) puts the f electrons in the 6th shell, which is wrong.
The other statements are correct: f-block elements are those whose differentiating electron enters an f orbital; the lanthanoids Ce to Lu (58 to 71) and actinoids Th to Lr (90 to 103) make 14 + 14 = 28 elements; and all actinoids are radioactive.
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