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

actinoids

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transition elements

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lanthanoids

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halogens.

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Solution

The correct option is C lanthanoids
In lanthanoids, electrons are progressively filled in $4 f$ orbital. The general electronic configuration for lanthanoids is $[X e] 4 f^{1 - 14} 5 d^{0 - 1} 6 s^{2}$

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