Which of the following statements is incorrect?

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The 4th period in the periodic table ends at krypton with the filling up of the 3p-orbitals

The 5th period in the periodic table contains the 4d-transition series

Starting element of 4d-transition series is yttrium

Filling up of the 4f-orbitals begins with cerium

answer is A.

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Detailed Solution

The fourth period ends at krypton with the filling up of the 4p-orbitals. Altogether 18 elements are present in this fourth period.

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