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What is the first element of the fourth transition series in the periodic table?(a) Scandium(b) Yttrium(c) Actinium(d) LanthanumThe question was asked by my school teacher while I was bunking the class.This is a very interesting question from Position of the Periodic Table topic in portion D and F-Block Elements of Chemistry – Class 12

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The correct answer is (C) Actinium

Easy explanation: The fourth transition SERIES or 6d series CORRESPONDING to the filling of 6d SUBLEVEL starts with Actinium (Atomic No. = 89) followed by elements with atomic number 104 onwards. These elements lie in the seventh period of the periodic table.



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