Explain the position of actinoids in the periodic table. ORWhat is the position of actinoids in the periodic table?

Explain the position of actinoids in the periodic table. ORWhat is th

1.	Explain the position of actinoids in the periodic table. ORWhat is the position of actinoids in the periodic table?
Answer» Position of actinoids in the periodic table : Group-3; Period-7. They interrupt the fourth transition series (6d series) in the seventh period in the periodic table. After Actinium, 89Ac which has electronic configuration [Rn] 6d¹ 7s², the electrons enter progressively 5f orbital and they have general electronic configuration, [Rn] 5f^1-14 6d^0-1 7s². They are fourteen elements from ₉₀Th to ₁₀₃Lr and since they follow actinium, they are called actinoids. They are called 5f series or second inner transition series elements and for the convenience they are placed separately below the periodic table.