P-2,3
Q-2,8,8
R-2,8,1
S-2,8,3
a) Which among these elements are included in the same
period?
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Answer:
ANSWER
a) P and S, Q and R - belongs to same period.
b) P and Q, belongs to same group
c) S
d) R belongs to 3rd period and 15th group
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