1.

the tenth elements in the periodic table resembles with areA. 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 ie, in second period `n=2` this shell has four orbitals (one `2s` and three `2p` ) which can have eight electrons, hence second period constains 8 elements from atomic number 3 to 10.


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