1.

the tenth elements in the periodic table resembles with theA. First periodB. Second periodC. Fourth groupD. Ninth group

Answer» Correct Answer - B
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 n=2, this shell has four orbitals (one 2s and three 2p) which can have eight electrons, hence second period contains 8 elements from atomic no.3 to 10.


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