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What is the first element of the fourth transition series in the periodic table?

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in Chemistry – Class 12 by (188k points)
What is the first element of the fourth transition series in the periodic table?

(a) Scandium

(b) Yttrium

(c) Actinium

(d) Lanthanum

The 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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