Question

Lanthanum is grouped with $f$-block elements because

• A. it has partially filled $f$-orbitals
• B. it is just before Ce in the periodic table
• C. it has both partially filled $f$ and $d$-orbitals
• D. properties of lanthanum are very similar to the elements of $f$-block

Answer 1

Answer: (D)

$La$ doesn't have partially filled $f$-orbital.