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Electronic configuration of elements P, ...

Electronic configuration of elements P, Q, R and S are given below. (Symbols are not real).
P-2,2
Q - 2,8,2
R- 2,8,5
S- 2,8
a) Which among these elements are included in the same period?
b) Which are those included in the same group?
c) Which among them is a noble gas?
d) To which group and period does the element R belong?

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Verified by Experts

a) Q, R and P,S
b) P and Q
c) S
d) group -17 and period -3
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