Arrange the following species in the order of decreasing ionic radii. Explain your answer. Ar, P, K, Ca, 5²-

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Actinides

The elements in which the extra electron tends to enter the 5f-orbitals of (n–2)th main shell are considered 5f-block elements. They are also named actinides. Actinides include 15 elements, from atomic number 89 to 103.