Actinides are those elements in which 5f subshell is gradually filled from actinium to lawrencium.

The Actinides series contains consecutive 14 elements from atomic number 89 to 103, from actinium to lawrencium, called Actinides.They are called Actinides because they start immediately after acitinium, the first elements of this series.They are also referred as second inner transition series.The first four elements of this series – thorium, protactinium, uranium and neptunium are occur in nature to a significant extent. All elements of the actinides series are radioactive. These are formed by the nuclear bombardment in which they release a large amount of energy.

Actinides series of 15 elements

Actinium is the first element of second inner tranisition series having atomic number 89. And further elements are –

Thorium (Th), Protactinium (Pa), Uranium (U), Neptunium (Np), Plutonium (Pu), Americium (Am), Curium (Cm), Berkelium (BK), Califomium (Cf), Einsteinium (Es), Fermium (Fm), Mendelelevium ( Md), Nobelium (No), Lawrecium (Lr).

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