Question

Descriibe Lanthanides and Actinides.

Answer 1

Lanthanides:

• It consists of fourteen elements following the lanthanum element.
• The electronic configuration of Lanthanides is $\left[\mathrm{Xe}\right]4f^{0-14}5d^{0-1}6s^2$
• The f block elements are known as inner transition series.
• It is placed in the period $\mathrm{VI}$ and is placed in between$58-71$.
• They are placed in between Cerium$\left(\mathrm{Ce}\right)$ and Lutetium$\left(\mathrm{Lu}\right)$.
• Their first elements are filled up to $4f$orbitals known as Lanthanide.
• They are non-radioactive, except for Promethium$\left(\mathrm{Pm}\right)$
• They are silver in appearance and magnetic in nature.

Actinides:

• It includes fourteen elements that follow Actinoids.
• Their electronic configuration of Actinoids are $\left[\mathrm{Rn}\right]5f^{1-14}6d^{0-1}7s^2$
• Actinides are placed in Group$\mathrm{III}$.
• It is placed in periods $7$and is placed in between$90\mathrm{to}103$.
• They are placed in between Thorium$\left(\mathrm{Th}\right)$ to Lawrencium$\left(\mathrm{Lr}\right)$.
• Their valence electron is placed in $5f$orbitals known as Actinoids.
• They are radioactive elements and form complexes.
• They have $+3,+4\mathrm{and}+5$ oxidation states.