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Question

Electronic configuration of elements P, Q, R and S are given below:
P - (2, 2)
Q - (2, 8, 2)
R - (2, 8, 5)
S - (2, 5)
Which of the following options is correct?
  1. P and Q belong to second period and R and S belong to third period.
  2. P and R belong to second period and Q and S belong to third period.
  3. S and Q belong to second period and R and P belong to third period.
  4. P and S belong to second period and R and Q belong to third period.


Solution

The correct option is D P and S belong to second period and R and Q belong to third period.
Elements with the same number of valence shells belong to the same period. Here, elements P and S belong to the second period since they have two shells. Q and R have 3 shells thus, they belong to the third period.

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