Question

Which of these belong to the same period

Answer 1

Answer:

a) Element A and B

Explanation:

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Answer 2

Answer:

Option (b) B and C

Explanation:

Electronic configuration :

:A=(2)

:A=(2)B=(2,8)

:A=(2)B=(2,8) C=(2,3)

:A=(2)B=(2,8) C=(2,3)Here element B and element C both have same number of orbits

:A=(2)B=(2,8) C=(2,3)Here element B and element C both have same number of orbitsTherefore the belongs to the same period