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 :Electronic CONFIGURATION of `X^(3+)` [AR] `3D^(5)` = 23 electrons. Since `X^(3+)` is formed by the loss of three electrons, number of electrons in X is = 23 + 3 = 26. Therefore, the ATOMIC number of the element is 26


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