The d-and f-Block Elements — Chemistry STD 12 Science — Question

→ The element in which last electron fill in f-orbital is known as f-block element.
→ f-block element is known as inner transition element.
→ The elements constituting the f-block are those in which the 4f and 5f orbitals progressively filled.
→ The two series of the inner transition metals, (4f and 5f) are known as lanthanoids and actinoids respectively.