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Assign the position of the element having outer electronic configuration (n-1) d raised to 2 ns raised to 2 for n=4,

3.30 Assign the position of the element having outer electronic configuration
(ii)   ( n-1) d^ 2 ns^2 for n=4.

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Given the outer electronic configuration of the element: 

( n-1) d^ 2 ns^2\ for\ n=4.

For n=4 hence the element belongs to the fourth period.

Since the valence shell contains (2+2) electrons and Group number = 4 configuration = 1s^22s^22p^63s^23p^63d^24s^2 element name is Titanium (Ti).

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