Q 2712823730.    

Assertion : The `5 th` period of periodic table contains `18` elements not `32`.

Reason : `n = 5 , l = 0 , 1 , 2 ,3` . The order in which the energy of available orbitals `4d , 5s` and `5p` increases is `5s < 4d < 5p` and the total number of orbitals available are `9 ` and thus `18` electrons can be accomodated.

A Both A and R individually true and R is the correct explanation of A
B Both A and R are individually true but R is not the correct explanation of A
C A is true but R is false
D A is false but R is true

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