A) first period
B) second period
C) fourth group
D) ninth group
Correct Answer: B
Solution :
Each period consists of a series of elements whose atom have the same principal quantum no. (n) of the outer most shell i.e., in second period \[\operatorname{n}= 2\], this shell has four orbitals (one Is and three 2p) which can have eight electrons, hence second period contains 8 elements from atomic no. 3 to 10.
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