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Q)

Which of the following statements about electron configuration of f-block statements is INCORRECT?

(1) The lanthanide series fill up the 5f sublevel and the actinide series fill up the 4f sublevel.

(2) There are four lanthanide metals that have properties similar to the d block. These are cerium, Ce, lutetium, Lu, and gadolinium, Gd and praseodymium, Pr (3) The first, middle, and last member of the lanthanide series have properties of the f block and the d block. (4) General electronic configuration of f – block elements is $(n–2)f^{1–14}(n–1)d^{0–1}ns^2$

$\begin {array} {1 1} Only (1) \\ (2) \;and \;(3) \\ (1)\;and \;(2) \\ (1),(2)\;and\;(4) \end {array}$

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