In which of the following valence electrons are located in the $f -$ orbitals?

Halogens

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Alkali metals

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Alkaline earth metals

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Noble gases

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Lanthanides

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Solution

The correct option is E Lanthanides
In case of Lanthanides, the valence electrons are located in the $f$ orbitals.
The last electron enters $4 f$ orbital. The general electronic configuration is $4 f^{0 - 14} 5 d^{0 - 2} 6 s^{2}$

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