The elements in which electrons are progressively filled in $4 f -$ orbital are called

actinoids

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lanthanoids

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halogens

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transition elements

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Solution

The correct option is B lanthanoids
In lanthanoids, electrons are progressively filled in $4 f$ orbital. The general electronic configuration for lanthanoids is $[X e] 4 f^{1 - 14} 5 d^{0 - 1} s^{2}$

Hence, option (C) is correct.

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Similar questions

The element in which electrons are progressively filled in 4f - orbital are called
(a) actinoids (b) transition elements (c) Lanthanoids (d) halogens

5 f

6 s, 8 p, 7 s, 4 d, 2 p, 3 d, 3 f, 4 f

Electrons in an orbital are filled according to which rule?

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