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The first atom with complete d-subshell is :

$(a)Sc\qquad(b)\;Cu\qquad(c)\;Fe\qquad(d)\;Zn$

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1 Answer

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The Sc atom has $3d^1,4s^2$ configuration.
Hence (a) is the correct answer.
answered Jan 10, 2014 by sreemathi.v
 

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