The correct statements among the followi...

The correct statements among the following
(i) `E_(2s)(H)>E_(2s)(Li)>E_(2s)(Na)>E_(2s)(K)`
(ii) The maximum number of electrons in the shell with principal quantum number n is equal to `2n^2`.
(iii) Extra stability of half-filled subshell is due to smaller exchange energy
(iv) Only two electrons, irrespective of their spin, may exist in the same orbital are

A

i and ii

B

ii and iii

C

iii and iv

D

I and iv

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