The Lanthanoids are placed in the periodic table at:

Left hand

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Right hand side

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Middle

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Bottom

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Solution

The correct option is A Bottom
The two rows that are generally placed underneath the main Periodic Table are called the lanthanide series and the actinide series.

These two rows are produced when electrons are being added to f orbitals.

Therefore, this block of elements are referred to as the " $f$ block".

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