Which of these belong to the same period?
Element A B C
Atomic number 2 10 5
A, B
B, C
C, A
A, B & C

Academic Chemistry NCERT Class 10

Correct Answer: (b) B, C

Explanation: Element B has atomic number 10, its electronic configuration is 2,8. Element C has atomic number 5, its electronic configuration is 2,3. As both elements have two shells, hence both belong to period 2 of the Periodic Table.

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Updated on: 10-Oct-2022

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