Q. Which of these belong to the same period?
Element A B C
Atomic number 2 10 5
A. A, B
B. B, C
C. C, A
D. A, B and C
Answer: B, C
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Element A B C
Atomic number 2 10 5
A. A, B
B. B, C
C. C, A
D. A, B and C
Answer: B, C
