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q402

402The electronic configuration of the atom of an element 'X' is (n - 2)S² (n - 1 )S² (n - 1 )p⁶ ns²np⁵. If n = 3 the element 'X' is placed in Modern Periodic Table (NTSE Andhra Pradesh, Stage-I, 2014-15)

Option : B
Explanation :

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