1.

Electronic configuration of a transition element X in +3 oxidation state is [Ar] 3d^(5) . What is its atomic number ?

Answer»

25
26
27
24

Solution :`X^(3+)= [Ar]^(18) 3D^(5) = 23 ` electrons . As `X^(3+)` is FORMED by loss of 3 electrons from X,X will have 26 electrons. `:. `At. No. of X = 26


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