An element with atomic number 15 belongs to which group and period?

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Atomic number 15 is phosphorus. Electronic configuration: 2, 8, 5. Number of shells = 3 (Period 3). Valence electrons = 5, so it is in group 15 (10+5) for p-block elements. Group 5 is for d-block. Thus Group 15, Period 3.

An element with atomic number 15 belongs to which group and period? MCQ with Answer and Explanation

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