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Electronic configurations of elements P,...

Electronic configurations of elements P, Q, Rand S are given below. (These are not actual symbols).
P - 2, 2
Q - 2, 8, 2
R - 2, 8, 5
S - 2,8
Which among these elements are included in the same period?

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The correct Answer is:
P and S, Q and R -belongs to same period
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MAXIMUM PUBLICATION-CLASSIFICATION OF ELEMENTS AND THE PERIODIC TABLE-EXAMPLE
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