Question

What elements are present in $f-$ block series?

• A. Lanthanoids
• B. Actinoids
• C. Lanthanoids and actinoids
• D. Lipids

Answer 1

Answer: (C)

Lanthanoids and actinoids

Answer 2

$f-$ black series is divided into two series
$ViZ$ $4f-$ series and $5f-$ series.
The members of $4f$ series are called lanthanides or lanthanons
whereas that of $5f-$ series are called actinides or actinons.