NEET UG CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Which of the atomic number pairs represents elements of s-block?

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Correct option: D

3,12

Option D (3,12) is correct because element with atomic number 3 (Lithium) has electronic configuration

1s^22s^1

and element with atomic number 12 (Magnesium) has electronic configuration

1s^22s^22p^63s^2

, both having their last electron in s-orbital.

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