Question

what Is lanthanide & actinides ...​

Answer 1

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Lanthanides and actinides are elements with unfilled f orbitals. Lanthanides are all metals with reactivity similar to group 2 elements. Actinides are all radioactive elements. Lanthanides are used in optical devices (night vision goggles), petroleum refining, and alloys.

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Answer 2

Answer:

lanthanide and actinides are f block unfilled elements

Explanation:

Lanthanides and actinides are elements with unfilled f orbitals.

Lanthanides are all metals with reactivity similar to group 2 elements.

Actinides are all radioactive elements.

Lanthanides are used in optical devices (night vision goggles), petroleum refining, and alloys.

Actinides are found primarily in applications where their radioactivity can be used to power devices such as cardiac pacemakers.