Question

The last element of actinide series is:

Answer 1

Actinides

• There are $15$ actinide elements in the universe.
• Except for lawrencium, which is a $d$-block element, the actinides use the f sublevel in their electronic configuration.
• Thorium and uranium are the only two actinides found in significant amounts in the Earth's crust.
• Actinides have strong electropositive potential.

Last element of the actinide series

• The filling up of $5f$ orbitals begins with thorium and finishes with lawrencium in the second $f$ transition series, often known as the actinide series.
• Lawrencium has an atomic number of $103$.
• It is the last member of the actinide series.