JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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An element with atomic number 20 will be placed in which period of the Periodic Table?

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Correct option: D

Option D (4) is correct because an element with atomic number 20 (Calcium) has the electronic configuration

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2

, indicating it belongs to the 4th period.

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